Mustard Dave
Contributor
My computer has no audible alarms whatsoever and I have never got into difficulties as a result. Years ago there was no such thing as dive computers and people had to plan their dives and monitor their depth and time on a mechanical depth gauge and watch. There are still people who choose to dive in this manner and do so safely. The answer is to monitor your instruments more often and don't be reliant on alarms going off.
Review on LP website:
I have Tinnitus and can't hear high frequency audible alarms very well. I actually went into DECO because of this on a Suunto (I was on air and the others on Nitrox...no one knew and I was so busy taking pictures I relied on the DM and other divers. Fortunately it was the first dive and there was no DC sickness. Lesson learned: take care of myself and not rely on others). The IQ-850 has a vibrating alarm and notification system like on a cell phone that works really well; I can easily feel it through my wetsuit sleeve. No more divers looking around to see who's alarm is going off. I can now notice my reminders and warnings in silence. 

I'll soon get the USB software transfer system now that I've successfully installed Parallels and W7 on my Mac (only used 10GB memory). It's really the only option and solution for Mac. Unlike the other user who had so much trouble with his IQ-850, mine has been flawless over 60 dives and a year of use. The only issue I've had is the display light on mine is very poor, I'm unable to light up the display on a night dive. Apparently this was a known issue on a certain batch of IQ-850's. Now that I'm home I've contacted TUSA on the matter and they said it's a known issue and to send it in to repair/exchange. They responded within hours and issued me an RMA; excellent customer service in my opinion. 

It's human to error and if you can't hear the alarms, it limits the use of a DC. If you have Tinnitus or hearing problems, this is the dive computer to get; it’s the only one I know that vibrates.
Whoever wrote that is blaming Suunto for their own shortcomings. There is a saying that I have heard a few times and like to use myself - 'diving is safe, as long as you remember it is dangerous'. If you cannot take responsibility for your own safety, you really need to change your ways or you should not be diving. The person writing that review relied on other divers and a computer, and both failed to grab him, shake him and tell him he has exceeded NDL.