I dive with the OCI and a Atomic Cobalt as well. They run fairly equivalent algorithms. I have the black with the chrome bezel. My buddy has the black on black. If I had to change I would go with the black on black as my chrome scratched quickly. As to operations - I really prefer it over the Cobalt simply because I prefer a wrist mount for easier viewing - especially on safety stops. I have not used it in a deco situation.......yet.