I've always rented dive computers while on trips, but I would like to have one computer that I am comfortable with. My local dive op carries oceanic and besides giving a good price, he will be there if there are any problems. That is the main reason that I have narrowed it down. My question is how difficult is it to become familiar with these computers if I'm only diving 2x/year on 7 day dive trips? Does anyone have experience on the learning curve? I don't want a computer that I'm going to have to re-learn every time. I've looked through the manuals online and they do seem a little complicated. Thanks.