Ozone is a lot more dangerous than some people think it is, not that I know of anyone who died from an aquarium ozone generator, it is possible, I have heard of people killing their entire tanks with an O3 generator before. Not that you cannot go blind by staring at a UV lamp, but that seems move obvious and easily avoidable to me.
Most of the concerns with Ozone are myths. Implemented correctly you're far more likely to harm yourself touching lights or getting infected cuts and scrapes from working in your tank.
Using commercially produced Ozone generators (vs. the hobbyist DIY kits you buy on eBay).
A few minutes on Google, Reef Central or looking over Wet Web Media, or anything Anthony Calfo writes will quickly disprove the rumors.
There was an article back in 2006 by Randy Holmes Farley in "Reef Keeping" that suggested how toxic Ozone can be - although the levels that escape the tank/ozone generator at maximum output are rarely higher straight out of the skimmer than a good day in Los Angeles or any other major city - that piece gave rise to all kinds of urban myths about the dangers of Ozone. Don't get me wrong - Ozone is toxic, but so is saltwater - and drinking DI water is bad for you, and working in a tank without gloves can kill you with various infections, Lion Fish can cause anaphylaxic shock, etc.
Ozone is a great option, and not worthy of alarmist claims - especially if used properly (as is true for 95% of things in this world).