I'm nearly 1,000 miles into riding this bike and absolutely love it so far. This is a great price to get a carbon fiber bike with decent components. Given the specs and testimonies of friends, I think it would actually 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 bargain price-point is great because it frees up additional money to get aero bars, repair kit, etc.
This bike provides a smooth ride. I've noticed such a difference from my previous aluminum bike. It handles well and is pretty light weight. The farthest I've ridden has been just over 50 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 this in mind and go easy at times.