Not serious trail riding by any stretch of the imagination, but I took mine for a spin around Thaba Trails on Sunday morning. Thaba is fairly rough, rocky with lots of short, steep ups and downs, the longer downhills are quite rocky too. I found the bike climbs really nicely, and on the downs it feels like I'm too slow for the bike, if that makes any sense. It's like the bike just wants to go faster and I'm holding back. As my confidence builds, I'll get off the brakes more and let it rip, it definately instills a lot of confidence. One thing I did find is that it requires quite a bit of "body english" to change direction, your riding style needs to be quite aggressive.
I can see I'm going to have a lot of fun on this bike!