Thanks for sharing this info. HJB - very helpful.
I am one who had the flap, but it was far from "invasive" - at least in the way that you are choosing to define the word.  Acoustic neuroma surgery is invasive - BAHA surgery doesn't even compare  

  I don't think my doctor - or any other doctor - would let a patient have a highly invasive procedure under local anesthesia, but I might be mistaken.  
I did not have a huge incision - it was small.  I have never had an infection - either while healing or since having my implant (2+ years ago).  I don't have a lot of hair removed - my processor covers that area perfectly.  My implant site healed very quickly.  I didn't have any complications either.
I'm happy to hear that you love your BAHA.  I love mine, too, and that's what it's all about  

However, I don't want you to scare people away from getting the implant - just because their doctor may choose to use the flap style instead of the slit style.
As we Forumites know, doctors often have different surgical "styles" - as well as different protocols in AN treatment - but that doesn't mean that one doctor is better than another in this aspect.  It also doesn't mean that one doctor is "wrong" and the other is "right".
Best,
Jan