I have an Craftsman RAS that's probably 1970s vintage. It's my dedicated crosscut machine, and I've been happy with it. It holds adjustment pretty well and only needs occasional tweaking to keep it in line.
A co-worker of mine is cleaning out his father's workshop, and he has a Montgomery Wards RAS for sale. How does the quality of the Craftsman compare to the Montgomery Wards? If they're about the same, I'm sticking with the Craftsman. I'd probably buy the Wards RAS only if it's enough of a step up in quality over the Craftsman to be woth the hassle of getting dust collection set up for the new RAS and selling off the old one.