Fail proof? Not completely. Everything can fail. I'm suggesting that this computer is practically fail proof, and practically without fault.
Own it, read it, liked it. I still dive computers. I also have deco tables for generic square dives as well as often dive custom cut tables and contingencies. Doesn't mean I don't like my computers even more!
Yeah, it was the Predator several years ago. The Petrel is the lighter, smaller, faster, better version of it. There's nothing wrong with the Predator at all, except that the screen Mfg stopped producing that screen. Shearwater took advantage of that and made it even better! Plenty of people still dive the Predator, and there are tons out there with a decade's worth of heavy tech diving on them. There's a reason that the Predator was the #1 suggested until the Petrel came out, and the Petrel has been #1 since: They're fantastic.