Vermis,
The metal version is better, there is no doubt. The wings are really flexible, which is disconcerting as the bendiness means plastic dinosaur from the toy store to my hands. It is not bad though, just a strange feeling. The metal one is in the $30 USD range while the bones is $10 though, so there is that to consider.
The fishman is a Julie Guthrie sculpt, as is the snakeman. They are very clean sculpts and are nice in that material. The fishman is really good for having thin parts. The snakeman swords are really flexible.
When you put them in a display cabinet though, they look almost like metal minis. And for gaming, they are going to be very forgiving to clumsy players. I am still not sold on them completely, but I am rapidly losing my prejudice about the material.