So many problems with the match-up against GK. Our vehicles just aren't effective, FNP just isn't effective and we don't get to hit first in combat all the time. I had an unpleasant experience with Quicksilvered GK Terminators with swords once.
That being said, I can't get all het up about GK with 6e around the corner. Everything could change in a few weeks, theoryhammering until then is a futile.