Funny you mentioned about a wireless computer going out in a middle of a dive. Just the other week I was supposed to go diving with my older cousin and he always talked so highly about his wireless computer, etc.
Good thing I came a bit later than expected and we both had actual time to check our gear. Well, hate to say his stupid wireless computer had a battery dead. I told him to check the battery in the antennae thing but he kept on pushing that one was changed. Needles to say our week long plan to go diving in Lake Mead was shattered.
He also asked me about my hosed computer and I told him I have never had a problem with it plus it was hundreds of dollars cheaper than his.