Compared to the other (iRig etc) options, this is massively cheaper.
It doesn't quite accommodate my (slimline) case, but that's fair enough as my iPhone 5 fits snugly without the case. However, often the screw on the back falls off when I unscrew it to mount/unmount the phone. But once in it's secure.
The clamp connector fits the diameter of a standard mic stand but goes no wider, so will only allow you to fit to the thinnest part of a standard mic stand - It would be nice if it could go a little wider.
All in all good value for money, but perhaps the more expensive products are a little better. However, I bought two of these and am more than happy with them.