I read through some threads about the delta drum sanders where the belt tracking adjustment was tough to get right and needed to be adjusted each time the machine was used. For me that was a non-starter. Any machine that needs finicky adjustment I tend to stop using. Here's an example of the type of reviews/threads I read:
31-255X Delta X5 18" x 36" Drum Sander-Discontinued by Delta. Basically, poor table adjustment and tracking design. I wanted a drum sander that I could walk over to, adjust the height, and it would work. Drum sanders can screw up your almost-finished project in a hurry if the work piece pauses under the drum for any reason. That's why the auto adjusting belt speed in the later model Jet and Supermax models is so awesome.
As I remember it, I read that the evolution of drum sanders went from finicky (early Performax, Delta, possibly Grizzly etc.) to pretty good (later Performax, Jet) to awesome (Supermax, later model Jet). Like anything, some people love their Delta/Performax/Grizzly drum sanders... I went with the Supermax brand for its excellent reputation and when I called customer service, I spoke to a technical rep at their headquarters in St Paul MN who knew his stuff. He helped me get my used machine back in spec in <5 min (pressure rollers were set incorrectly).
The resale value is also high on Supermax machines (because of this reputation I suspect).
My only caveat is much of this info is hear-say, I've only ever used the drum sander I own, but its awesome!
I agree with RWE2156, my Supermax dust collection is great, as long as I remember to turn on the dust collector
.