you need the sports models to do proper wheelies -- the balance is better on the chair giving a decent amount of stability. Your standard hospital-issue job just isn't up to it.

I got to spend a day in a wheelchair last year as part of our disability week activities, as a way to highlight just how w/c accessible my workplace actually is. I found some places that I'd previously thought were inaccessible weren't, with a little effort, but that some corners are a bitch.

But if worst comes to worst we'll get you into a Dalek that can go up stairs ;)