I've got one, and so do 4 of my mates now! A great singletrack weapon, as well as being light and generally fast. The frames around 3.5lbs for an 18" I believe.
If you're after an occasional race bike that rides fast and can be ridden far, it's the frame to have I'd say. One mate's currently in 5th in the Gorrick series on his, mine rode past Rob Lee on the MaXx Exposure last year at about 50miles, it was definitely the bike! So that's short fast & twisty and long enduro performance tested and proven.
I used a Superfly (exact same geometry) for "a bit of a long ride" a couple of weeks ago and it was simply awesome. Long ride planned tomorrow with much playing in the woods. Pace is staying in the shed and the Paragon's coming out. Case closed!
Surely there can be no more questions. Just get one, you won't regeret it. Just Shhhhhh.... don't tell anyone or we won't have an advantage over the rest of the world any more!
As for frame cacking. Well, I bet you could find stories of any frame cracking, being the victim of alien abduction or spontaneously combusting if you searched the web hard enough. Just don't read the american forums "I'm 28stone and I bent my bike..... ", duh! well obviously!