Well, I have now played around with them a little on M4/M5:
There is a huge number of styling morphs and they appear to work.
Some textures are installed into the wrong place and you have to manually locate them.
I had to do a lot of fiddly manual positioning of the hair on the head and use smoothing, but this could be because of my lack of expertise and there may be easier ways of doing it. The main problem is in getting the cap positioned.
The rendered result doesn’t have the sophisticated look that you would expect from something from AprilYSH for instance, but for non closeup images should be OK. It would be really nice if an updated version was done by a PA (hint, hint).
So, I would say - go for it! At those prices it is worth it.