Ive just spent a little time mapping in hex (just to see what it does)

Its got some pretty impressive features, but its not very intuitive.  I did get it to do most of the things you'd normally associate with uvmapper..and it gives a better immediate feedback of how the mapping is going, but its bulky (slow) in comparison to many of the same functions if they were done in UV mapper.

So in my opinion, UV mapper has the leg up on this app in that aspect (for speed and intuitive interface).  Id hate to have no experience with Amapi and have tried to do this. I can see how it would be very very confusing.  I think Id use both tho if I were really making something (personal or for sale).  Id use Hex for the intial rough mapping, and then go to UV mapper for the tweaking.

BT