I have the one from divervision. It's pretty strong, but I wouldn't use it for Wide angle lenses, since you're floating in open water and the heavy lens may fall off somewhere deep. With macro ones it's not an issue as you're close to the bottom and can catch the lens, plus they're not too heavy.
Only issue I've seen is the adapter makes your lens sit farther from the port, so you have to zoom in all the way. Not a problem for fixed lenses like 100mm on DSLR, or if you always zoom in all the way on a compact, but I have some macro lenses that are +5 diopter, and I use them semi-zoomed out to get wider portrait style angle on medium sized animals (10 - 15cm size). Then you'll get vignetting if lens is too far in front of port.
Edited by bintang_shrimp, 14 February 2019 - 10:19 AM.