Personally, I wouldn't go so 'ergonomic' for the buttons, since it's actually not the way the fingers tend to sit when curved. First column of buttons lower, but then the next three columns should be in line. That's more ideal for the way the fingers naturally sit when using an arcade.
But if you've tried it out an like it, them YMMV. Personally, I didn't find it worked so well for me in practice.