-Yes, these are bigger and bulkier than your traditional Peg, forcing you to use more of an open-hand grip instead of a closed-grip, but their real Training Advantage is changing your hand orientation from palms facing (normal peg) to palms away (balls). So it's more an open-handed pullup, rather than a neutral pullup. This changes the grip and forearm emphasis and is more akin to real-world climbing and scaling.
-But remember, it IS bigger than the traditional peg, so it's not a 1-1 exchange, it's a training progression.