Bought mine about 1-1.5 year ago. I had some shitty mousepad at the time(which worked alright for my previous mouse tho) and abyssus was jittery on it, but after changing to SS QcK I never experienced anything like that again.
I have both a mirror and normal edition and neither appear to jitter on qck+ or puretrak talent. The clicks on the normal edition appear to be a little heavier than the mirror edition ones though.