Unfortunately when i posted my previous reply, only one of the 3 or 4 sentences got posted, the other 2 or 3 are somewhere out there in cyberspace. If I remember correctly that I went on to say the focus confirmation isn't necessary or even accurate ...
I would stay away from the chipped adapters, they are more expensive and will not even operate on all digital bodies even in manusl mode, Ie. one chipped for a 60D will lock the camera up on a T2i.