Sorry this kit is not vinyl resin, just vinyl. However some of the kits have resin parts included also for fine detail parts.
I found a couple of sellers on Ebay selling the same kits, my kits came from a seller in Thailand, but im not sure who sculpted them.
I found the vinyl easy to work with and fitment very good. The figures go together like dolls, so a lot of the limbs 'clip' into the sockets. This allows the limbs to be moveable. I use CA glue and any big gaps fill easy with hobby putty. A sharp box cutter slices through the vinyl very easy. Ive never had to heat it, unless i wanted a different pose, setting it in cold water. I think they are very cheap for the size / scale.
Im working on a Predator at the moment, i should have it finished and posted today.