I have two, one for my PPS and one for my G19. IWB I prefer them to the supertuck that I had for my XD. I am a skinny guy and I swear the leather on the ST covered half my body and just seemed unnecessary. I have IWB and OWB clips from NTAC, I much prefer the IWB setup since its so easy to put on and take off without fussing around. They ride high with the provided OWB clips and I don't feel its particularly stable even with my wilderness 5 stitch. IWB they rock, the PPS is forgettable and with my new belt even the G19 and a spare mag are easy to carry all day, at least until I sit down a restaurant and get the "butt thud".
Also wanted to add that the best part, to me, is that they add no weight or appreciable thickness to the gun. Consider a kydex IWB holster the ultra thin condom of the concealed holster world.