Technically, I carry my P30 in Condition 2 since I have the LEM V2 (DAO) trigger. For those who don't know, Condition 2 is defined as, "A round chambered, full magazine in place, hammer down." I always carry +1, as well, loaded with 147gr Federal Tactical HST and one or two extra mags. I almost always carry in an IWB Crossbreed SuperTuck holster, and rarely in a Blackhawk! Serpa CQC holster.
From day one, I've carried with a round in the chamber. That's not to say it didn't take a little getting used to, as it did. The former Army special forces and current Phoenix SWAT / peace officer who taught my CCW class made it clear that carrying any other way was pointless, and if we planned on carrying in anything less than Condition 2, he said we should get pepper spray and a knife instead and forget about the class. He is also a big fan of the adage, "One is none, two is one," and so he carries two guns at all times. He also made it clear that on more than one occasion had he not been carrying his duty Glock 22 with a round chambered, he'd likely be dead... Twice! ...That's all the evidence I need.
To me carrying without a round in the chamber makes as much sense as leaving your alarm system off, then hoping you have time to set it off if someone breaks in. I mean if you get jumped and you're fiddling with your gun trying to rack it while getting stabbed or beaten to death.... Or if someone shoots you in the arm.... Or if you get tackled.... Or times infinite scenarios where not carrying with a round chambered in an object designed to carry, chamber and discharge said rounds.... There are just way too many variables and scenarios where carrying unchambered will undoubtedly get you killed. Not to mention that getting all dead or seriously wounded, the BG will steal your firearm and then (do whatever he wants with it)...
Honestly, if you're worried you can't keep your finger off the trigger while your firearm is holstered in a proper holster, (oxymoron), you probably shouldn't be carrying at all. The chances of a modern firearm going off without pulling the trigger are equivalent to getting struck by lightning twice, at the same time.
Rant over.