I have a different Oceanic dive computer, but I can tell you they do last. I have had 2 of them for years without a single problem. I always keep extra batts. in my dive kit as they both seem to go through them rather quickly, but that is no major thing. I am shopping for new computers now, but I am going with the Dive Rite Duo as I like the features and how it works.

Just be sure to read the book and mess with the computer BEFORE you go out for a dive as they all work a little differently, and some work a lot differently.