I took a Next Full Suspension bike out mountain biking one time. While it was fun, when i got back the bike was pretty much dead. The front fork was bottomed out and stuck, the crank was bent, right pedal spindle was bent, and the bottom bracket started squeaking terribly. In its defense, I did jump with it, went on some pretty gnarly trails, crossed a few streams, and did stuff it simply isn't designed for. We started calling them single use mountain bikes.

Only thing that surprised the heck out of me is the wheelset, it stayed quite true and strong.