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I don't have one of the numbered units, but I still love my OC-1. 

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If you are going to spend 1k+ Buy a Shearwater and never look back, it's not AI, but it's so far beyond the Oceanic computers it's sillyness.
the atom 3 log book keeps the end tank pressure whereas the oc1 does not
Ok, here lets simplify it. Diving the OC1 is the same as diving the ATOM 3.0. They are pretty much the same computer except the compass works better on the Atom 3.0. Oh, and here's the kicker... The OC1 is 1800'ish, the Atom 3.0 is just over 1k. Hmmmm... that makes it simple.
If you are going to spend 1k+ Buy a Shearwater and never look back, it's not AI, but it's so far beyond the Oceanic computers it's sillyness.
FYI, I have all three computers in stock. Where should I ship it?