My only complaint about them is the "z" button, which you have to contort a tad to reach.

Ah, but there should be at least one or two buttons which fit that description on the controller. You need to have buttons that are hard to press accidentally, but which you still don't have a lot of trouble remembering how to reach them. In the game, those buttons are coded for the least-used special features. The slight contortion to reach the rarely-used button is actually a feature, you see.