My Mark 2 is my #1 pistol as far as accuracy goes, but it's a total beatch to reassemble no doubt about that, at least if like me you wait long enough between cleanings to forget the necessary tricks. In fact, I've never really looked at a Mark 3 because I'm told they're even worse to deal with. My real problem with the whole line though is that they don't operate like standard semiautos, rather, by using bizarre controls and a totally different mag release, and so my Mk 2 messes up my muscle memory if I use it too much. Just totally fun to shoot though, and it always makes me look good when the targets are examined.