It's hard being my bicycles... Many of my friends are strictly mountain bikers, but as I already have two bicycles and am keen on resisting obeying the 'ideal number of bicycles to own = n+1' rule, I'd rather hang on to my road bike and my cyclocross bike rather than adding a proper mountain bike to my tiny little stable. Hence, the cyclocross bike is now serving as my 'go anywhere' bike.
I don't think it enjoys that role all that much.
Gotta give props to KHS, the manufacturer of my entry level aluminum cyclocross bike. That thing is built like a tank (and weighs very much like one, too). I have been far from gentle with it, but it has survived all sorts of rough rocky and sandy trails. I'm running 33mm clincher tires, and have never flatted on the trails (I have caught 2 flats on paved road, though. Go figure!). The wheels are so sturdy that they are still running true after all the hard bumps.
Truth be told, my next CX bike will probably not be a KHS since I don't like how it handles all that much (and the severe toe overlap is really hard on my ankle during trackstand and other maneuvers). The bike is a good and sturdy entry level bike for those into adventure riding rather than racing, though.