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Maggie,
I use two Oceanic Delta II Nitrox Regulators for my deep diving. (Down to 70
metres, or about 230 feet.) One has a balanced piston first stage and the other
a balanced diaphragm first stage.
I can't fault either of them, or tell the difference in breathing resistance at
depth between the piston and diaphragm first stages.
I guess the choice is ultimately yours but thats my 2 cents worth.
While on the subject of Oceanic regulators, never buy a Slimline. The best
comparison to it's breathing resistance is "like trying to pull a breath
through a vacuum cleaner"

Geoff.

PS I am a deep tech instructor working in Australia.
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