I have an N82 IWB. I have the professional model. It is the only one I have used so I can't say it's the best or it's the worst. It works well for my Shield. I didn't want some of the other brands that have a lot of material to evenly disperse the weight or whatever they do. I wanted something compact like the pistol. After all, the Shield is light.
I have no problems with mine other than the clip screw comes loose. I am sure I can rectify that with some Loc-tite which I will do at some point. I can wear it all day even sitting in my car and it feels fine. I won't go so far as to say I forget it's there when sitting, but when I'm out and about it really does virtually disappear.