I tried the dual carry and it sucked for OWB carry. Would not stay close to the body. I bought the inside heat and it put a scratch on the slide. I wound up with a sof-tuck and it works great for a IWB carry.
I also bought an inside heat a few weeks ago.and tried it for a few days. It was okay but it is thick. Adds probably at least 1/2" thickness to gun. I ended up buying a a blackhawk arc iwb which is a heavy polymer but not altogether kydex. Very thin and comfortable. You can also adjust hieght and cant.