I carry a P3AT daily, as a backup gun or primary depending on tasks, where I'm at, attire, etc. I have it on an ankle holster primarily but also have a belt clip on it. I can wear it while wearing sweat pants or gym shots and it only weighs 11oz fully loaded even with a mag extension. Can't say that about many guns.
I have small hands (that's what she said) and it works OK for me. For anyone with bigger hands, I could see it being hard to hold onto. It aint a big gun at all. I use the Buffalo Bore super hot 380+P gold dot HP loads. It's not quite 9MM power, but it's a juiced up 380! It functions great, even at a $240 retail price I paid for it.
I was looking for a PF9 about a year ago and found a used P11 for a steal used so picked it up instead. The trigger sucked, but it worked OK. It was more "hi point" in feeling and fit and finish than my P3AT or a PF9. I sold it not terribly long after when I picked up my G26. The PF9 is much slimmer, and a better trigger than the P11. I think they are a great option, and I plan on picking one up sometime for a really small and light compact 9MM.