I've just seen a thread on the French Esprit Apnée forum where an owner of the Chinese Chen Bin monofin prizes it highly over Glide, Hypper, Breier, and WaterWay monofins that he also tried. I did not hear about that fin before, but according to the Chen Bin website, it seems to be rather popular among monofin swimmers, and several records were broken with it. I wonder if anyone here on DB has an experience with it.