Just received my Crossbreed Supertuck
IWB, configured to my M&P full-size and compact pistols. This has to be the most comfortable IWB I have tried. Even with my full-sized M&P, I can easily run at a good rate of speed, bend clear over from the waist to pick something up from the floor, bend my upper body from side to side, sit down in a variety of types of chairs without getting jabbed, etc.
I got the horsehide option, and also tried the new approach with a velcro strip running clear around the inside, and velcro clips on the holster. The clips attach to your pants, the belt covers up the clips completely, and to top it off, you can tuck your shirt between the clips and the holster (as with all super tucks), so you get great concealment with these things. I'll have to see how well this velcro approach holds up over time, but initially, I like the way it conceals, and it seems to hold up just as strongly as regular clips. For guys that need total concealment and don't want any clips showing, this seems like a good option.
This pic isn't of my holster (mine is LH and has velcro clips), but is the natural horsehide version that I bought.