I have the Jet JBOS-5, and it is a heck of a sander. It's kind of heavy--around 80 lbs, I'm guessing. I love it. However, if I were to do it again, I would most likely go with the Rigid. It's highly recommended by almost everyone who has used it. I believe it's a little lighter and less expensive.
Like I said, the Jet is a whale of a sander, but it's overkill for my needs. At least it has been so far. It is very quiet and smooth, and it has a wide range of spindle sizes. Like I said I really like it--but it's also about $500 at Amazon now. If buying now, I wouldn't get it.
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