Cat 6 (as is Cat 5) is a specification of not only the cable, but also the ends, the panels, the pulling force, the installation technique, the pin out, etc.
I have seen a lot of Cat 5 cable that could not do 100 meg because the 'installer' untwisted 3 inches of wire to put on ends, which ruins the run. I have seen a lot of Cat 5 where the installer did not make pins 1, 2, 3, & 6 into pairs. ruining the run. I have seen some Cat 5 runs that were terminated into odd, non Cat 5 faceplates, ruining the run.
If I had a site that needed Cat 6 (I would go to Cat 6A, unless you are sure Cat 6 'buys' you something you can't get in Cat 5e) I would use premade Cat 6 cables or hire an installer prepared to certify his work.
I tried to remain child-like, all I acheived was childish.