I have what I'm guessing is the older Ridgid and it does ok for what it is, I primarily just use it as a spindle sander.  I also have a much larger 6x89 JET edge sander that sees everything big and small so I don't have to fart around with the belt sander on the Ridgid.  I also have a JET 12" disc/ 6x48 belt sander that is used primarily for the disc sander.  Each has it's place but together they do take up a lot of real estate I don't really have room for.