I can see why this bike won't please everyone, nor should it. Firstly, it is a relatively heavy bike. With the Madfibers it's still about 16 pounds. Second, it does look "odd", especially with it's fusion of tri and road geometry. I didn't like it one bit when I saw it in the TdF, but changed my mind quickly when I laid eyes on it in the flesh, although I didn't get to test it until earlier this month when the 51cm frames were made available.
On its maiden voyage this morning, I managed to drop the chain even with a chain catcher, and took off some paint near the BB where the chain got stuck between the small chainring and the frame, though it's not noticeable at all. This was my fault, as I was toying with the Di2 system, and trying to shift the FD while sprinting. Not sure if the problem was exacerbated by the Q-Rings, but I never shifted the FD while sprinting anyways, so it's not going to be a problem.
I'm still getting used to the shifting of Di2, having come from mechanical Ultegra. When shifting the RD, it shifts so smoothly that the only way I can tell the shift is complete is by the resistance on my legs. I don't see a problem while trying to downshift multiple gears either, as I can click the shifter 5 times rapidly, faster than I can when I need to downshift 5 gears with mechanical Shimano. Yes, it won't be as quick to dump gears like Campy or SRAM can, but it's not bugging me too much.
The FD shifting is also very fast and smooth, but I think the Q-Rings may be causing a problem when shifting into the big chainring, there seems to be a delay when the chain catches on. I might consider moving back to a round chainring, given that one of the big advantages of Di2 is its precise and quick FD shifting.
From my short ride on DA Di2, I simply can't tell a difference in the performance of the two. If I had to nitpick, I think the Ultegra FD might be a little bit noisier. Weight aside, they pretty much perform the same.
I'm not sure if it's the psychology of a new bike, but I was amazed by how fast I was going with the same amount of effort as my old ride. In conjunction with the Madfibers, it was extremely quick to spin up to 40km/h and beyond even with a headwind. Downside is that in the crosswinds, it felt somewhat unstable (for reference, I weigh 125 pounds). The new geometry also eliminated my toe overlap problem, and I felt more confident while cornering as a result.
Still a few issues I need to fix- my shoe was hitting the crank spindle at times, and I need to get the handlebars down a bit lower, so I need to swap out the stem for a negative rise one. Other than that, I'm happy with it so far.
2012 Cannondale CAAD10