Suitability of these Hollis Regulators?

[Kingpatzer]

I'm in the process of gathering the required items for my first foray into technical training. I'm thinking about putting 2 Hollis DC1 212's on the manifold. Are these regulators adequate for a beginning tech diver? How well will they scale with advancing in the tech realm?

Thanks

 

[SailNaked]

that is what I have, and it was recommended by the Tech instructor (shop owner). I bought them when they had their spring deal (same now). with a free octo and 7 ft hose. they are cold water rated and sealed. I need to have mine serviced to be sure, but even new they would free flow at the surface unless they were tightened down. they breathe very free actually too free, you have to tighten them down or else you have constant air loss. once they are dialed in at depth they seem to be ok.