Why the dealer price is usually the better deal
The machine on a dealer's floor and the one in a big-box box are often not the same machine at all. Brother and Janome, among others, build separate model lines for mass retailers and online marketplaces with different model numbers and feature sets, and dealers will tell you the mass-market versions are built to a lower price point, so a Brother or Janome from a warehouse club or a general marketplace is not directly comparable to the Brother, Janome, or Baby Lock in a dealer showroom even when the plastic looks similar. Bernina, Baby Lock, Pfaff, and Husqvarna Viking sell new machines only through authorized dealers and their own official websites, which usually route the sale or the pickup through a local dealer anyway, and the same brands will not honor a warranty on a machine bought from an unauthorized marketplace seller, so a new machine from a gray-market listing typically arrives with no valid warranty. What you are paying for at a dealer is bundled in: a set of owner classes, often free with the machine, that walk you through threading, tension, buttonholes, and every foot in the box; a service department that can do warranty work without shipping the machine to a regional center; often a trade-in program that gives real credit toward your next machine; and a person who will answer the phone in six months when the bobbin case keeps jamming. Some dealers also throw in feet, extension tables, or a starter thread kit, and many will price-match another authorized dealer on the same model. Ask what is included before you compare sticker prices, because two dealers listing the same number are rarely offering the same thing.
Mechanical versus computerized, and where each brand actually shines
A mechanical machine has a motor, a handful of cams, and dials for stitch length and width. It is cheaper, simpler to service, and a good one will outlive you; the Janome HD3000 is the classic example. Juki's straight-stitch-only TL series sits in its own category, with no stitch selection at all but a thread trimmer, needle positioner, and speed control, and it is the machine quilters and garment sewists buy when they want a perfect straight stitch at high speed and nothing else. A computerized machine adds stepper motors and a circuit board, which buys you a needle up and down button, automatic thread cutting, a knee lift on the higher models, an adjustable speed slider, and hundreds of stitches you will mostly never use. The single feature worth paying for on any computerized machine is a good automatic buttonhole and consistent stitch quality on thick seams. As for brands: Bernina is Swiss, expensive, and known for stitch quality and heavy metal construction, with the 3, 4, 5, 7, and 8 series being what most dealers stock and the 9 series as the current flagship. Janome owns Elna and makes solid mid-range machines at fair prices. Pfaff's IDT built-in dual feed walks the top layer of fabric in step with the feed dogs and is the reason people buy Pfaff. Husqvarna Viking, Pfaff, and Singer share a parent company, and Viking and Pfaff share much engineering. Baby Lock sewing and embroidery machines are largely built by Brother, with their own feature sets and dealer support. Modern Singer is mostly a big-box and online brand; the vintage Featherweight 221 is a different story.
Sergers, coverstitch, and why air threading is worth the money
A serger, called an overlocker outside North America, trims the seam allowance and wraps it in thread with loopers and one or two needles, which is how ready-to-wear knit garments get their finished edges. Every sewist who works with knits eventually wants one, and it is the machine that benefits most from being bought at a dealer, because threading a serger is the reason so many of them sit in closets. Baby Lock pioneered jet-air threading, where you drop the thread in a port and a puff of air shoots it through the looper; their sergers are built by Juki, and the entry air-threading model costs several times what a manual-threading Brother 1034D does, and dealers will tell you the extra money buys you a machine you actually use. Juki, Janome, Brother, Pfaff, Husqvarna Viking, and Bernina now sell air-threading sergers of their own, so ask to try more than one. Juki's manual-threading MO-series models are the workhorse budget option, and Janome, Bernina, and Pfaff all sell respectable four-thread machines. A coverstitch machine does the double row of stitching on the bottom of a T-shirt hem, with a looper thread covering the raw edge underneath; it looks like a serger but has no knife and does not finish edges the way an overlocker does. Combination serger and coverstitch machines exist from Baby Lock, Juki, Janome, and others, and they save bench space at the cost of a conversion process between modes that some owners find tedious. Bring a knit scrap and a woven scrap to the demo and ask to see differential feed adjusted on both; a serger that puckers a woven or waves a knit at the default setting is not set up correctly.
Embroidery machines and longarms are not a mail-order purchase
Machine embroidery and longarm quilting are the two categories where buying from a dealer is close to mandatory. An embroidery machine holds fabric in a hoop and stitches a digitized design; the number that matters is the maximum hoop size, and the jump from a 4 by 4 inch hoop to a 5 by 7 to an 8 by 12 or larger is what separates the price tiers. Brother and Baby Lock dominate the entry and mid market, Janome's Memory Craft embroidery models and Bernina's combination machines sit above them, and a top-end Bernina or Baby Lock combination sewing and embroidery machine costs about what a used car does. The dealer sells you the stabilizer, the software to edit designs, the extra hoops, and the class where you learn that stabilizer is what actually makes embroidery work. A longarm quilting machine rides on a frame that is commonly eight to twelve feet wide, with smaller hobby frames available, and lets you quilt a whole top without wrestling it through a domestic throat. Handi Quilter, Gammill, APQS, Innova, and Bernina's Q series are the names you will see, and they are sold, delivered, set up, and calibrated by a dealer, sometimes with a computerized robotic system added on for edge-to-edge pantograph work. Ask a longarm dealer whether they rent time on a floor machine, because renting for a few quilts is how many people figure out whether they want one before spending high four to five figures.
How to test drive a machine, and what service actually costs
Do not sew the dealer's demo swatch. Bring your own: four layers of denim, a piece of lightweight knit, a quilt sandwich with batting, and something slippery like rayon challis or chiffon. Sew a straight seam, a zigzag, and a buttonhole on each, then sew off the edge of the denim onto air and back. Watch whether the machine climbs a thick seam without stalling, whether the knit waves, whether the chiffon gets pulled into the needle plate, and whether the buttonhole is the same size twice. Test the reverse, the needle down, the thread cutter, and how much you have to fight the free arm cover. Ask to see the service bench, ask how many technicians work there, and ask how long a routine tune-up takes to turn around; one to three weeks is common, and longer waits are normal in busy seasons or at shops with a single tech. A routine service, which means cleaning out the hook race and feed dogs, oiling, checking timing, and adjusting tension, generally runs from around a hundred dollars to a couple of hundred depending on the machine and the brand, and most dealers recommend it every year or two for a machine sewn on regularly. Sergers and embroidery machines usually cost more to service because of the loopers and the extra mechanisms. Used machines from a dealer are typically trade-ins that have been through the bench, often come with a short warranty, and are one of the best ways to get a Bernina or Pfaff at a fraction of new; a dealer used machine with a warranty beats a marketplace listing with none.