They may have fixed stuff since I got mine. Back nearly 20 years ago there was no turning off the O2 setting. And setting up the computer the day of the dive, you didn't get that much time. You set it up just before you splashed. It might give you an hour between setting and splash. Setting it up before you left the dock wasn't going to work, it would time out.
Keep in mind this was the first affordable computer that had Nitrox compatibility. Not long after Nitrox changed from the devils gas to acceptable, and few places taught it. I saw it as an upcoming way of diving and spent a little more for it. It was many more years later before I actually got certifed in Nitrox. And the computer logged a whopping 10 dives or so. Compared to tables it was amazing. Just use it as an air computer, it was OK. But the Nitrox integration wasn't refined at all.
Sounds like they learned of the faults of early ones like I had and made them a little more forgiving. Nothing compared to a Shearwater. The user interface is so friendly. That would be another reason they have so many fans.