Anyone have any experience wiht the new Shimano 105 gruppo? How does it perform versus the Ultegra or D/A?

Also, anyone know what the weight difference is between the 105, Ultegra and D/A gruppos?

Thanks!

don't want to hijack the thread, but does anyone know how much 105 10sp groupo cost? and where is the cheapest place to get them?

There is a very favorable and informative review located at:
http://www.gearreview.com/shimano_105.php

Happy riding.