Casper is the grue on the one piece mask. Sounded GREAT...I tried and it was even better than GREAT. However it is just one more thing to look after and where does one put it when in shallow water? The original Tribord has a much better rating than the knock-offs. It is easy to breath in, good front view and almost side-view mirrors. When you get deep enough, like over mustache depth, it is very hard to hold your place in the ocean and dig. And forget about even shallow dive. Your grab for a target "pushes" you up and away as the full face mask is filled with air and is very buoyant. It is a wonderful mask, better than the snorkel and eye / nose mask and each has its own special place for use. You will never know how it works for you unless you try it. I did and I enjoy using it even when not detecting.