I know their sales methods are a bit....uh....suspect? And I don't know if the price is really worth is (but worth is dependent on what you value it at, and is a personal decision) but at the very least, you can take comfort in the fact that it is a very good vacuum that should last you forever and ever and ever. It's also a fairly versatile machine, so it can do quite a bit more than just clean the carpets.
I'd never buy one myself since I only have 1 small room with carpet in my house, but I'd surely consider one if I had a big house with lotsa carpet and a bunch of rugrats and/or dogs. And of course, if I had a spare $900 to toss at a vacuum. And if I could convince myself that it would be a better purchase than an Orek XL (which would be tough).
But in the end, you did get a damn nice vacuum.