Deep concealment rig
I've used a Thunderwear rig for over 3 months now with my SP101 revolver. Very similar to the Smart Carry variation. I wear mine every waking hour of every day and everywhere I go. Here in MA, open carry is frowned upon, so you have to conceal it well in order to stay out of trouble. Two things I find disturbing about this style of holstering.
First, I practice drawing....a lot! The fabric at the seam where the revolver's hammer sits, is starting to show wear already. A disappointment, to be sure. I'm confident this rig will not last the year.
Second, again, concerned with drawing, even with daily practice, at least 1/10 draws hang - again by the hammer. This is disturbing as I never know when it will hang, even though you can free it easily enough. In an emergency, an extra second can be critical, as you can imagine.
But all in all, it is a very comfortable rig to wear and I have no problem with the position. Sometimes, if I'm wearing an untucked shirt, I will raise it high enough for the grip to be at the belt line or just a bit above. Being sufficiently concealed, yet allowing much quicker and positive access. JMO.