Thanks GED I've been back and forth on this, I have a G19 and would never part with it. I'm starting to get my wife into shooting pistols so I wanted something she could use to, I looked at the Kahr cm/pm9 hell I could barely rack the slide, diamondback to sketchy on reliability, and the beretta nano is just out so if sig, db, etc had some teething issues with micro 9's I'd assume the nano could have the same problems.
I ain't gonna lie to ya, the Glock 26/27 series is a pocket full of gun. If you are on the slim side, it's gonna show. However, I do know of one other member here who's kinda slim who also pocket carries a G27 with no issues. Maybe he'll chime in and give you his take on it as well.
It took me about a solid two weeks before it didn't drive me absolutely nuts. But it's like anything else...you overcome and adapt.