This thing is way more posable than an G.I.Joe. Or...anything, really. I have a thing for super-posable action figures, and I've never seen anything that's even close to as flexible as the SFBT-3. Original Joe has 14 points of articulation (15, if you count the waist as two). I've seen a few super-posable figures and model kits with 20-30. SFBT-3 has more than 80. For God's sake, it has individual finger and toe joints.
It really is amazing, and I'd get one just to play with except that (a) it's $300 and (b) the deeply incongruous boobs are embarrassing. If they make one that's reasonably proportioned, I'd have to seriously consider a purchase.