I tried ripping some skeltons from TR4 and most of them were invisible or partially transparent so I was very happy to find this!
It simply does exactly as it says, but here's a little break-down to explain my review..
Original - well most of it's from TR4/5 so this rating mostly refers to your 2 custom skeletons... there was one exactly like a TR4 one but it had a cap so that wasn't very original. The pirate skeleton (don't remember this in the game so I assume you made it) was excellent and now I'm tempted to make a pirate themed level! Finally there isn't a pack like this that i'm aware of. kudos.
Useable - great for all levels except bases/cites/home levels. Usefull to warn of traps, enemies or just give a morbid feel to your level.
Custom Textures/meshes - the cap didn't look that great (texture wise) to be honest but in a dark room it looks fine (where else would you put a skeleton?) while the pirate one was very immpressive, both texturing and mesh.