The first 50 hours I liked it, the next 350 I still liked it. Then you get after more than 400 hours a CO2 hit and you think: what a @#$@#$@#$@# Machine. LOL. But more serious: A ccr gives you freedom and nice dives, but it is not safer or usefull on ALL dives. Some are better on oc or sidemount. And if you don't practise, a ccr can become dangerous. Be a trained and thinking diver.