Hi Sean
When you say deep how deep? and how long?
Well for example when I dive the Socorros those dives are 75 plus. I would like to be able to stay down longer than what a Steel 100 would give me. Also, with the re-breather and doing photography work I can linger around. I know these are expensive units but feel that the ability to just sit and linger to get the shot would be worth the cost.