I've been using my new N2ition 3 (N3) in Bonaire this week, alongside my Duo. Same settings, same NDLs. I used the Trio manual, since it did not come with one and I have been unable to locate one on the web. It is NOT exactly the same as the Trio! For example, one of the things I did not like about the Trio was the auto set of Nitrox to 79% N2, 50% O2 after every dive. But the N3 is like the Duo: it keeps the gases until midnight, so you only have to reset it each morning if the Nitrox stays the same throughout the day. Nice. Also, some of the button pushes are slightly different....still working on that one. Need.the.damn.manual.