Well i tried the demo. Results look good and will look even better if you retouch the UV-mapping at some neuralgic points (sides, neck, top of the head). The problem with Facegen seems to be their license. As every model is just a morph of the base head they can be quite easily recognized. I think it’s good for Renderings, but for realtime game engine projects you will have the following obstacle:
If you want to sell or distribute the 3D models themselves - for instance as part of a software product - you need a Re- Distribution License
quoted from their website.
Then it won’t be useful for non-commercial projects anymore, cause that will cost half a fortune