Ooooh network certifiers are fun to play with... It makes running cable so much less exciting, as you know if it's good or not the moment you punch it down. Cat6 is a marketing ploy, all right... Last time i was in my favorite local electronics shop, the owner was on the phone and told someone what they wanted didn't exist, then offered to go check and make sure because "Cat 6 doesn't exist, but we've got it".

Matthew