vjb.knife
Contributor
Since 1970 I have had a few. I still have my original SP MKV and it works, but I do not use it any more. In between then and now I have had quite a few USD, SubAquatics, Mares, Atomic Aquatics and Poseidon. At work I dive a SP MK11 with a S600 mounted on a SP full face mask which is OK. I use it mostly because for long duration dives I like the FFM. When I sport dive it is always with a Metal Cyklon 5000. Since diving the Cyklon 300 and Odin way back I have stayed with Poseidon and now that I dive a lot more recreationally I really prefer them.