I just wanted to give you my brief opinion regarding the quality level of the new Ultegra 10 vs. the Dura Ace 10. I will be asked numerous times over the course of the year my opinion about the two Shimano 10 speed groups. Initially, I can say that without any doubt, that DA is worth the extra $$$. That's not to say that the new Ultegra 10 isn't a great component group....But is there a substantial difference between the two? My short answer is yes. That being said, I was impressed with the latest build that I performed that involved mainly an entire upgrade to Ultegra 10, less the derailleurs (Yes, an Ultegra 9 rear derailleur, as long as it's in good condition, will work with Ult 10 STI's , chain, and cassette). Can I honestly recommend a 2005 Ultegra 10 group or at least a drivetrain upgrade? Absolutely Yes. Is the Dura Ace worth the difference in the price? Again, absolutely yes. That is if it's in your budget... In closing, the new Shimano Ultegra 10 is a great way to get into the wonderful world of 10 speed without breaking to bank. That's it for now. Thanks for reading!