I also own a B-9 ( minus the dust collector; they usually are broken or lost) and am quite fond of it, although having the motor mount in the front is a little awkward. Porter Cable made excellent tools, both handheld and stationary , sanders being one of their strong suits. If you have any tracking issues that the roller adjustment doesn't correct, the upper roller arm on the B-9 can be rotated to line up the roller parallel with the sanding platen.
I can post a photo of my work table if it helps.
-James Huston