I used a Smart Carry for about two years. I worked as a driver for a company that didn't allow even so much as a pocket knife while on the clock. Another driver with whom I was a friend got mugged one night by at least two guys (who were never caught). They used a cinder block to cave his head in and he spent the next three weeks in ICU not expected to live through it. He did live and made a full recovery, but I decided then and there that jobs are a dime a dozen (or at least were back then), and since I only got one life to defend, no company policy was going to prevent me from utilizing every option I had towards that end. Smart Carry was the answer.
Couple of pretty significant cons though. The worst drawback is in addition to what Axe said about it being harder to get to, it's literally impossible to get to while sitting down or while getting out of your vehicle. That was a huge disadvantage working as a delivery driver going to businesses and stranger's homes where I could be surprised like my friend was. Since it was really the only option I could find at the time that wouldn't get me fired pretty quickly, I used it for the duration of my time there nonetheless.
The second con was that the hammer of the two weapons I usually carried back then were exposed and rubbed holes into my pants. They started as little tiny pin-holes, but progressively expanded and frayed becoming quite noticeable. If I'd tried to continue wearing those pants, eventually the weapon itself would have become visible. Perhaps a hammerless revolver or semi-auto like the Kel-Tec PF9 that I have now would not have been so hard on the britches, but I ended up going through three pairs of pants before I stopped the fraying by putting a piece of leather hanging loose over the hammer. I tried canvas from an old duffel bag, as well as a flap of Cordura, both of which slowed down the deterioration, but also both of which succumbed to the rubbing and allowed it to get through to my pants in pretty short-order too.
Bottom line, a good answer to the question of deep concealment, but they do have their limitations, especially if you contemplate having to use it at times that you'll be sitting. The wear on the pants should be preventable now that you know about it and what solved the problem for me, but there's nothing that I found to address the problem of limited access while sitting.
Blues
