Hey, I'm weighing-in a little late on this one. I've been using a Kramer Confidant for nearly two years now, first with a SIG P239 and now with a P228. I usually wear a medium- to heavy-weight tshirt under the Kramer, then a button-up outer shirt.
I do still prefer belt-carry, but living in the humid south I'd gotten tired of always slipping on one of those fabled photographer-style vests. The Confidant's really freed me up garment-wise. One does just have to keep in mind, as some of the previous posters have alluded, this rig is definitely built with stealth in mind first, speed a very distant second.
I've carried in all weather and for as much as 16 hours per day in this thing. Mine is need of replacement as some of the shirt material just below the holster pocket is eroding where the slide of my pistol is rubbing against it. A good post-carry weapon wipedown becomes even more critical with the Confidant as you will definitely get sweat on the weapon. Depending on how frequently I'm actually wearing the Confidant, I can keep it smelling "mountain spring fresh" with a toss in the washer and an overnight hang-dry.
As the Kramer site suggests, buy a Confidant smaller than your normal tshirt size. I normally wear XL or even XXL shirts, but my Confidant's an L and works great.
"Yes and Amen" to the comments on no-hugging while packing in the Confidant. I'd recently posted over on
www.SIGforum.com how, at last, I may finally have been "made" while carrying with this rig. My wife and I were attending a very interactive comedy-murder-mystery-dinner-theatre show, and when part of the show called for audience and cast members to dance, I was unexpectedly grabbed around the middle by a classic "sweet little old lady" who wanted to boogie. If she even noticed the press of the SIG against her, she didn't react...maybe she thought I had a medical device strapped to my ribcage or, heck, maybe she's a CCW-holder like myself and was already wise to the ways of the Confidant.
Anywho, I am curious to try a good IWB tuckable rig, too, but the Confidant's continuing to serve me well. The thing does have TWO holster pockets, so maybe that's the justification I need to get myself a second P228!