I'm about 200 miles into this bike and absolutely love it so far. This is a great price to get a carbon fiber bike with pretty nice components. Given the specs and testimonies of friends, I think it would outperform other bikes a few hundred dollars more expensive. If you want something substantially better, you'll have to pay quite a bit more.
This bike provides a smooth ride. I've noticed such a difference from my old aluminum bike. It handles well and is pretty light weight. The farthest I've ridden has been just over 40 miles and I was pleased with the comfort level for a continuous amount of time.
The Shimano 105 components are great, but not the best for aggressive shifting, so it's important to keep it easy at times. Needless to say, this bike would probably be the best for more intense racing.
I did have some trouble with Backcountry on their shipping--it ended up arriving a few days later than expected, despite expedited shipping. This was the first issue I've had with shipping over the past several, so I'm not too worried about ordering more stuff from Backcountry.