They're the one of the worst if not the worst idea in Transformers engineering. It might seem like an easy way to get 360 degree articulation in arms or legs, but I'd rather have no movement at all. They just pull out too easily when they're the anchor holding on an appendage. Second problem would be with clip joints(stuff like the joint at Energon Inferno's shoulder, my worst case). I don't know if they do those anymore, but I'd avoid that too. In Animated, I've heard about a few toys with peg joints, and I'd have to say that they cut my chance of getting a figure in half. I hope Hasbro's reading this. So which toys have them and which don't? Cybertron Mode Prime = no Earth Mode Prime(Voyager) = yes, on leg Earth Mode Prime(deluxe) = no Prowl = no Ratchet = on leg? Bumblebee = no Lockdown = no Grimlock = on leg? Snarl = no Cybertron Mode Megatron(Voyager) = no? Cybertron Mode Megatron(deluxe) = no Leader Megatron = no? Starscream = yes, on legs. Worst case. Lugnut = no? Voyager Bulkhead = no Leader Bulkhead = no Blackarahnia = no Soundwave = no Oil Slick = no Sentinel Prime = no Blitzwing = on arms? Jazz = no There don't seem to be too many, but some like Blitzwing, Ratchet, and Grimlock are on the line here. I'm skipping Starscream already because of this. Any input, maybe from people who have the figs, would be much appreciated.