Thanks for your response!
My both jaws were moved forward, so I also needed something to advance my cheekbones, otherwise it would look really weird. I like it because my cheekbone area was asymmetrical before and now its more symmetrical and just a little bit more prominent. So yeah I like it now, but to be really honest I would love it even more if the advancement was a little bit more.
And I dont know about the mm's, im sorry!