paul wrote:1) Cost.
2) Until you have practiced enough, it comes off the rope easily. Not a safety issue as you are still connected to the rope with two jammers, as per the normal Frog method. Just a pain.
3) Its a bit of a pain when passing deviations (called "redirections" in the US?) as you have to detach the Pantin from the rope and re-attach once past.
4) It could be a problem in a very tight vertical pich if you raise your right leg too far and cannot kick backwards to detach the Pantin nor reach down and detach it.
Try one and you'll buy one!
It is for those reasons (particularly #2) that I don't use this revised frog addtion. But that's just me.
I would like to see a version of that Pantin enlarged to a "basic" size and having the same wrap around the foot configuration harness so that it could assist in a (real) ropewalker/double bungee.