...but I can see some advantages, specifcally, very long square cuts, much longer than I can make with my compound miter saw...
TMI Warning!!! IME there are two days of satisfaction with a Craftsman RAS, the day you acquire it and the day you pawn it off on some poor dupe. Perhaps the vintage 100 series is somewhat an exception to that reality. A Craftsman, yes, will make long cuts, but consistently square is probably not possible. You can painstakingly align the saw in all axes, but the moment you pivot to rip, mitre, or bevel, it will almost never return to square alignment. They were poorly constructed of cheap materials to be peddled as impulse purchases to indiscriminate hobbyists.
Raymond DeWalt invented and popularized the RAS for the trades. Emerson, (the contract manufacturer for Sears) fired the starting pistol for the race to the bottom to make cheap consumer targeted RAS $#!T. If you look at vintage ('50-60's) AMF DeWalt's they are constructed to withstand a direct nuclear hit. Many are still in use today. (Mine is about 1959 vintage.) Once Black & Decker bought AMF, they joined Emerson in making ever more crappy saws. Depending on your use and definition of long cuts, a quality table saw, compound mitre saw or sliding compound mitre saw is, IMO, a much better choice than any post 70's consumer RAS.
I have and use my RAS and it consistently earns its footprint in the shop.
There is a reason Craftsman RAS's dominate the used for sale market. It is not just because they were produced in massive quantities.
Of course, as in all things, YMMV!!
Cheers,
Geary