FWIW....After years of carrying a Govt. model SA M1911a1 concealed, my little P-01 is a treat. (forgive me JMB) I can carry it either open or concealed at work. Laugh if you must, but I tether it with a Blackhawk pistol leash 'cuz to be honest, this gun's so light I have actually panicked once or twice when I didn't feel the weight I was used to on my side and thought I'd lost the bleep thing.
I'm not "sculpted" correctly to do the IWB-thing, so that's not an option for holster style. I'm convinced Blackhawk's gonna pull their heads out soon and put out a level-II Serpa for the P-01, so I'm holding out for that. Me, the leash and the "Israeli plastic" are getting along just fine until then. (yes Virginia, I'll lose the leash with the Serpa)
With a light shirt worn out over the pants, I'm finding there's a real risk of the grips, and ESPECIALLY the rubber mag bases grabbing the shirt and flashing someone. If the plastic base pads for the Beretta actually fit, I'm going that way and it looks as if there's a few folks that turn out some really nice wood grips.
As for "printing"....I was helping out at a Friends of the NRA banquet last year (shhhh, not an NRA member). Several Sheriff's Deputies were present, along with some explorers from the SO. As I moved around the banquet hall carrying auction items etc., I noticed one Deputy watching me closely. He eventually came up to me and said "I noticed there's something on your side under your shirt." I replied, "Yep, it's my colostomy bag...wanna see?" He said "really?" and when I smiled he just walked back to where he had been standing. I'd read that line in a gun magazine years ago and wondered how it'd work on someone. (not sure what I'd have done if he called my bluff...then again, what the hell was he asking that question for AT AN NRA EVENT?!?!?!?)
ah yes....the "new breed" of LEO..."gun bad, citizen bad, Government goood."
anywho...end of early-onset-senility ramble