Originally Posted by Markedoc
I upgraded from 2003 Ultegra double to 2004 DA 10 (double, of course) and am VERY happy with the upgrade. Net cost (sold Ultegra on ebay - only had 100 miles on it) was around $600 since I got a great deal on the DA 10. Buddy of mine did the installation.
Shifting is much smoother and more accurate, and much less noise coming from the rear derailler and chain etc.
Markedoc brings up a good point. Don't forget to factor in the cost of installation.
I have 1 bike with Ultegras and 1 with DA's and the DA's amazes me everytime I take it out. The shifting is incredible. Mind you, I'm one of those people that don't buy into the hype that because it cost more, it will work better. I loved the Ultegras before I got the DA. I actually had my bike spec'ed with Ultegra but changed my mind at the last minute. Anyway, I have no regrets going with the DA's.
If you do upgrade, keep the Ultegra BB. What they say about the Ultegra BB being superior to DA is true. My brother had to replace his DA BB with Ultegra BB after only 3 months of riding. I'm sure I'll have to replace mine soon too.