I don't have any experience with them, but just checked out their website and looks interesting... My first thought was lack of retention, but it appears as though the magnet does a pretty good job of keeping the gun in place even though it is a "universal" fit. The two videos they have on their homepage look pretty convincing. I'd trust it a whole lot more than an uncle mikes or other "universal" clip-style holsters, but at $70 and up, I'd tend to go the traditional route of a double clip IWB unless your talking about a smaller firearm that wouldn't need the extra stability of a double clip holster.
My EDC is either a Stealthgear Onyx or a Clinger "No Print Wonder" and I like both of them. (Firearm is either an XDm 3.8 compact or XDs - different holsters for each firearm.) I just like the extra security of a formed kydex shell to make sure nothing is going to put any pressure on the trigger. But with that said, I bought my wife a Galco leather IWB holster for her LCR, but that thing has such a long (and stiff) trigger pull that I'm comfortable with that setup.
Just my 2 cents... If you do decide to try it out, let us know how it works out!