For example, not everybody does Campy very well.
And SRAM Force and Red Group are different.
http://www.pezcyclingnews.com/defaul...lstory&id=4395
I was discussing the benefits of the new Shimano Dura Ace with the SRAM Red gruppo, to find he disliked how some of the Red assembles. But this was a Shimano shop and they never like working on Campy systems.