Great review.
I've been on the fence about this tune and a BMW PE for my E91, but like you, have no local shop that can do the AA tune for me, so I'd have to send it to them and be without my car for a few days.
Think maybe I'll do the PE and decide on the tune later. Maybe by then I'll have a local shop who can do it, which would make my decision to do it MUCH easier.