The Good: Looks, fit, leatt and goggle integration.
The Bad: Mostly the high price. Strap system (at least on mine)
What can I say, it really is the benchmark. My previous helmet was the D2 and before that a 661 Evolution Carbon and the D3 is simply the best. It's not as light as the Evolution carbon but the fit is simply perfect, as is the integration with the leatt brace. Having experimented it with Spy, Oakley and Hebo goggles I had no problems. For those that use glasses like me it is kind of tough to put them on, but after you set them up they stay put without problems. Also, I don' know if it was just my specific helmet, but sometimes the strap is really hard to get loose. Price is high, but the consequences of a bad helmet in a crash are also enormous, and if you do a good search on the web you can get some helmets from the previous season at a good price.