Pretty damn good according to this review on Vital MTB.
If you don't have time to read it then here's the all important verdict.
If I had 6 grand lying around, like that Geico money with the eyeballs, I would swoop the Remedy 9.9 up in a heartbeat...without a second thought. Since I don't, I would save up, go into debt or investigate the more affordable models if I was in the market for a kick ass trail bike. That whole "do it all" moniker seems kind of hokey, considering one bike can never do everything well, but the Trek Remedy seems to come as close as possible. If I was going to own one bike, and one bike only, this just might be it.
Get on the bike and see for yourself. Trek has a boatload of dealers throughout the world and a Factory Demo program, so you'll have no excuses.