http://youtu.be/bqyyNrOIatU I am really enjoying this thread!

Fabian Cancellara has been mentioned (be still my pattering heart), and the video above from the 2009 Tour de Suisse is him riding at his best. Awesome is the word!

I have a Felt B2, an old one, which I ride in triathlons. I've also ridden it on a few occasions just to ride and I do train on it when I need to. I totally agree that it's a bike that is NOT comfortable for day to day riding, and the handling is indeed twitchy. It handles better when I'm on the base bars (gripping the bottom bar by the brake levers) then it does when I'm on the aero bars. On the aero bars I've discovered that it is steered with your elbows, and the inputs need to be gentle.

It is NOT heavy. It's an aluminum frame, old school, carbon forks, a mixture of Dura-Ace, Ultegra and SRAM Red components, Zero-Lite wheels (which aren't light), but it only weighs 18 pounds.

It IS major fun! I average higher speeds on it than I do my road bike, because, yes, I'm in a more aero position and it takes less effort to sustain a higher speed than my road bike requires. I don't have the TT helmet or any slippery clothing, either.

My opinion on the (gorgeous) DA the OP posted the picture of was that it was set up for a "fun" casual ride. The bars were high (easy to change on the pivot stem the DA has), and the seat was low, plus there was a seat wedge bag on it. Price? $8 to $10K.