I just wanted to make this post because I've seen people in BST's threads singing the praises of the 3366. I expected more out of a competitive gaming site.
I reviewed the mouse here: https://www.youtube.com/playlist?list=PLZ2riVNLJly0KG7Z8albMETEmbRB8bCzd
along with most other 3310 mice.
I've used a ton of mice over the past 10 years. Almost all non-MLT04 mice have some kind of "smoothing" feel (which is likely caused by a few different factors such as input lag/click latency, and artificial processing of mouse movement)
to them. The 3366 has it too, just maybe to a slightly less degree than it's most recent predecessors.
However, the KPM had the least and felt significantly more precise, and snappy.
EDIT: wow... I feel like I'm talking to a bunch of people trying to sell mice rather than fellow competitive gamers...
I can't believe how many people on here don't know about this... I know I've seen it talked about on this site.