I rode last years F600 until it got stolen a couple of weeks ago. I can't compare to the specialized but I really liked the bike. The Avid discs are awesome - really strong braking. One thing - the frame is really stiff. If that's what you're used to then fine.
Headshok is pretty nice but you don't really get a whole lot of travel. Best for XC without too many big bumps. I didn't have a problem with the components - the cranks could have been better - thats about it.