Late to the party but you got a really nice bike Aaron. I mountain bike a lot, my main form of sustained cardio work to stay in shape. I prefer the FS bikes, I'll never go back to a hardtail. Most all of my riding is rough single track in the Black Hills and the HT's will just jar your teeth out. I have a trail right out of my driveway and it is about 1.5miles of rocks on a 17% grade.
For those inquiring, most of the rear shocks no longer have a lock out function on them. They are much improved over the previous models where the bike would collapse under you if you were really into the pedals on an uphill. They now are set by your weight and they don't give as much. You can set the rebound speed on them but not actually lock them. I was skeptical of this system but it actually works really well. Currently riding a Giant Trance and like the suspension better than the lockout I had on my older Specialized. Much more functional and I make some long steep climbs and there have been no issues.
Aaron, have you ridden a 29er before? This Giant is my first and there is good, bad. It is not nearly as "nimble" on downhills as a 26 inch bike. Fast corners will feel completely different with the big wheels, it is going to feel like you need a parking lot to turn the thing around and takes a lot of getting used to. You will really notice/feel the difference when you start taking it downhill on a tight trail. Be careful the first few times. I don't think I'd get another 29er if I had to do it again. It climbs nice and really rolls over stuff on the trail but I'm not a fan of how it handles. I find it big and clumsy for lack of a better term.
I would add, Runtastic makes a great, free mountain bike app for smartphones. It will log all of your rides, keeps track of distance, where you went etc. At the end of the ride gives nice summaries, % grade, %uphill, %downhill etc. Times you in 1 mile splits. Really nice for mapping your progress as you can ride the same routes and see how your times differ etc. They also make one for road biking and hiking.