There was too much flex in the frame for my liking. You'll want to test ride it, especially accelerating or going up hills where you torque it the most. I have the Emonda for my primary road bike. Carbon frames should be more forgiving than Al on longer rides. But they're also a little more fragile, so you'll want to consider a couple things. The frame will last longer if stored indoors where it isn't exposed to temperature fluctuations. You can't use a hitch rack that clamps to the top bar. Don't store it where you constantly have other bikes rubbing against it. If you carry a frame mounted pump, where do you attach it, etc.

I also have an older Trek 520 (steel frame) I use as my commuter. It's a softer ride than my road bike (35mm tires at 70psi vs 23mm at 120psi). But I also prefer to ride it in colder weather, because it's a lot less likely to get a flat. So I'm less likely to be sitting on the side of the road on a cold windy day fixing a flat with freezing hands. Trek's current 520 complete bike uses some pretty low level components though, so you may want to think about upgrades. Obviously its a little slower than my road bike, so consider that if you are riding in a group you want to keep up with.

As Vippie mentioned, you should plan on buying a new saddle that fits your sit bones. It may take some experimentation to get it right.