Category 6 specifications added more stringent electrical requirements to the test specifications. Since the bandwidth increased from 100 Mhz to 250 Mhz, there was a need for tighter requirements.
The wire itself is constructed differently to comply, generally tighter twists, a web center that keeps the pairs separated, bonded pairs where the insulation is actually melted together, flat type construction with individual compartments for each pair, etc.
The terminations them self are relatively the same, however, to get the channel to pass it takes some care. In the old days, we could kink (and then unkink) the Cat5e and get it to pass, this is often not the case with Cat6. I've had a channel not pass, simply open the modular connector, reterminate it carefully, and it will pass.
In short, all the things you heard about Cat5e that you HAD to do to make it pass (but really didn't), you pretty much do for Cat6. Mainly the reason it is 'harder' is the wire often takes a bit more time and care to strip and prepare, the connecting hardware is also sometimes more precise and requires maintaining the twist very carefully (not adding twist to the pairs either), and pulling the cable in needs to be done more carefully.
In my estimates, I have different labor rates for Cat6 products, some are rather wicked on time requirements for installation and termination.
Good Luck!
It is only my opinion, based on my experience and education...I am always willing to learn, educate me!
Daron J. Wilson, RCDD
daron.wilson@lhmorris.com