I've got a 2010 "Cyclocross 5", which is what they called the CAADX last year. It's a great bike for a lot of things. Geometry is a little more upright. It's a comfortable ride, largely due to the bigger tires. Great for a bad weather bike, commuter, light trail. I'll bet it could even be used for cyclocross if you're in to that sort of thing ;-).

I'm more road oriented, so I just swapped out the chainrings on the FSA crankset to 50/34. Took the Aksium wheels from my new Scott to replace the horrible Maddux wheels it came with. Have a set of take off RS10s from my CAAD 9 which I mounted with some 28mm Conti Gatorskins, great for road/touring. I'm going to start experimenting with brake pads to see if I can improve the perfomance of the Tektro cantilevers. Getting the wheels with the painted brake track off the bike has been a good start towards that.

All in all, a very versatile, fun bike.