Got the guy in the middle from BBTS today - thought it would be the same size as the Tamashi Nations Monsterarts fig (on the right), but he's noticeably bigger (Flints for scale.)
Overall, he's a good buy - $20 cheaper than the Monsterarts fig, 3 different heads, almost as much articulation - a fairly solid fig.
He doesn't have the range of motion of the Monsterarts version - can't put his arms down to his sides, can't squat, and his joints are a lot stiffer, but not bad.
I was hoping to use him for customs - and I still might. Was thinking about using him for an MOTU Gygor, but I've got an armored Grodd for that. He's too big for my Adventure Team (the Monsterarts fig is the "Sasquatch"/Gigantopithecus for my AT.) Maybe I can mod him into a Yeti. Makes a great standalone Kong, though - if you're into 1:300 scale figs
Cheers!