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I would think some of the older Dacors or maybe the Healthways "Scuba" might come close if you use a restored one. This design was pretty bad as DH regs go, you would have thought AL would have put some thought into it and produced a reg at least as good as the RAM. This reg has a small diaphragm and worse no venturi so it's performance is sub par to a vintage (restored) Royal Aquamaster (RAM) or DA Aquamaster (DAAM) which both have a fairly good venturies. If what you have in mind is trying a DH to see how one performs, then it's a poor choice. A restored DAAM, RAM, Mistral or Healthways Gold Label are all much better choices. The Argonaut Kraken is the next level above those and is as good as a DH reg gets.