I hadn't found an IWB I was convinced I would like enough to buy. I did buy and really like the Blackhawk OWB holster. I like the retention feature of the Blackhawk, I found that when my trigger finger releases the retention feature and my G23 is drawn, my trigger finger is directly above the trigger, along the slide.
G&G makes nice holsters, blackhawk 's are good for a little less money. I say you have to have several holsters per gun depending on what, when and where your carrying.
OWB is a Raven Concealment Phantom, which I love (and sometimes wear IWB). I've had different (and apparently better) experience with RC than the fellow who commented on "the folks running the show over there."
I use an OWB Snapslide holster by Crossbreed for my Glock 19, has worked perfectly for me, can't hardly see any trace of the gun (even with a t-shirt on, granted not skin-tight, but still). This is at 5'11 235 (heard that this sometimes makes a difference). My wife can never see it when I'm out and about. The IWB holsters just don't seem quite right for me.