I've got a Spec-Ops Brand T.H.E. pack and I love it....it's really well built. I don't want to say indetructable, but pretty close. It's also got an inner yellow liner, so when you're digging for stuff in the bottom of your pack at 3 AM with a red-filtered flashlight it's REAL easy to find stuff. My only gripe is the lack of internal supports.
I also have one of the latest Guns and Ammo "Combat Tactics" magazines (Sept 2005). There's an article entitled "Dressed To Kill" that was a head-to-head comparison of Eagle, Spec-Ops, BDS Tactical (formerly SOTech) and CSM gear LBV's/Chest Rigs and packs. The T.H.E. won the packs category hands down.
http://www.rstacticalgear.com/pd_specops.cfm