Owner of the Ridgid one and it's a good "spindle" sander, the belt is Ok but not that good. It's not going to give you a perfectly flat edge and 90 degree (like for glue joint) as the surface beneath the belt isn't very flat. Learned it the hard way a couple of times before I stopped using it for precise work.
I use the spindle version mostly and will get a larger edge sander.