6-pack as front range trail bike
I'm riding one locally and love it. It also is a replacement for a stolen bike. I've got to say, I'm glad it was stolen, cause I couldn't have afforded this bike otherwise, and the Pack is fantastic. Here's my thoughts on it.
Mine's built to 32 lbs, as an aggressive trail bike build. A lot of my riding buddies ride 575's and depending on build, they're usually a little lighter. I came off of a Weyless xp (heckler clone) and noticed a huge difference in the suspension performance. I've done some longer rides (20+ miles at Buffalo Creek, Indian Creek, Monarch Pass and in Fruita) and definately notice the weight, but the bike rides really well and I don't hesitate to take it on the long rides. The bike climbs the techy stuff well, and I probably don't need to tell you that it will give you a prema-grin on the descents. I think the Geometry is really good for trail riding if you're not super xc guy.
Couple things to consider: The Medium frame is the same size as a large spot frame. I really think an adjustable fork is the way to go with this bike. I've got an 05 Z1 on it and am very happy with it. I had problems getting a Pike to clear the downtube and have seen other people with this problem as well.
This forum is a great resource so do some research and you'll find tons of info on the bike. PM me if you want to see the bike, I'm in Denver.