Dude....don't cancel the order !
ATI drivers are pretty damn good....not the BEST, but nVidia doesn't make the best drivers in the world either!! Why do you think they need to keep putting out updates all the time!! And yes, I owned a nVidia TNT card back in the day, so I know what I'm talking about !!
The fact is, they're is ALWAYS going to be some kinda glitch with WHOMEVER'S driver you use, what these guys are prissing about is that they just can't stand that someone else puts out a decent card with DECENT drivers !!! And I've had my Radeon for 2 years now, and the drivers are FINE, EVERYTHING runs well, except for one game which was admitted by THE GAME PUBLISHER to not run on XP !!
Do yourself a favor, go by your own judgment, read the REVIEWS on the web (in google.com enter Radeon 8500LE 128MB and see all the reviews) and don't listen to singularities here in the forums !!!!