I use it on a fairly regular basis. What you have to be aware of is that left to it's own devices (defaults) it doesn't produce very good results. Probably the worst effect is that it re-sculpts the models face, often leaving the image looking nothing like the person you took a photograph of.
Fortunately this effect can be turned off. If you also take time to tune the program to your own preferences, and save that tuning as the default, the results are much more acceptable.
The results that you can achieve can all be duplicated in Photoshop; I just find that it saves me a lot of time if I have a lot of images to edit.