Well, if the FTE issue has well and truly fixed itself, then mechanically I love it. I love the controls, the ease of takedown, the trigger pull, the break, the sights. The only thing I don't love is the trigger reset, it could be a bit more positive like my G17c. Oh, also, the magazines are kind of crappy, I don't know what gives with them. The baseplates rattle and they just generally feel cheap.
As for ergonomics... I'm still on the fence. I think the grip might be a tad too skinny for me, it feels pretty small in my hand. When I'm shooting my G17c I don't even think about my grip at all, but when shooting the M9 I found myself adjusting my hand quite a bit. Not sure why yet, though. You choke up really high on this gun and the slide is super low profile compared to a glock or especially a Sig. Sometimes I feel like I'm ape-hanging the gun because I hold it noticeably higher than I'm used to holding pistols. The feel of the build quality and materials of the gun itself is all top notch.
Overall, I'm glad I bought it and will be shooting it a lot more, but I still like my G17c better.