Jet is a solid reputable company....not so different than General International, Grizzly, Shop Fox, and others that offer similar classes of stationary power tools. As with any brand, I caution that the brand itself doesn't perform any tasks...the tool does. Many tools from the same brand, have little correlation to each other, so it's always best to evaluate each tool on it's own merit. The brand is essentially a label, marketing, and a support system....often not a manufacturer any longer. Jet does offer a good warranty and a well polished dealer network... if those are perks that are important to you, expect to pay some premium for it.
Like just about everything else, Jet is imported from Asia. On and off over the years, many of the tools came from the same plant that was spitting out Grizzly, General International, Sunhill, Bridgewood, Woodtek, some PM, and many others. That's not to say that the tools from the same plant are identical, but the design and the castings are darn near identical, and many of the tools are more similar than different ....it's usually all the stuff that bolts on to the castings that differs....switches, motors, fences, wings, stands, bearings, handles, etc. There can also be some spec differences, but keep in mind that it's difficult for factories to offer different sets of specs for each brand...sometimes it's easier and cheaper to just offer the tightest spec to all of them if the capability is there.
The main point here is that Jet offers some nice tools, but I caution not to treat any brand with so much emotional loyalty that you convince yourself that everything carrying that label is awesome....make them earn your loyalty every time!