I happen to be quite fond of Dura Ace.

Raced on it many years ago. Worked great. Love the way 7400 hoods/shifters feel in my hands. They just fit me perfectly.

We chose to use it then because the price was excellent w/ our discounts.

We also chose to use it then cause it rocked! Fantastic for racing.

I just got used to it over all of these years.

Last summer I rode an FP3 w/ DA 10 speed in Tuscany and I loved it.

Nothing wrong with Ultegra or 105 though.

Ultegra is the model of choice I see on so many local crit racers' bikes. That or SRAM Force/Rival.