I like big butts and I can not lie....oh wait thats the other board sorry. I dive a RANGER with air source. From Zeagle. I dove it for about 2 years steady 3 dives per week min. In swift black water. AKA Yellow River in FL. And in the keys and various trash outside of Destin FL. I have been tossed around a couple times from getting hung in roots to getting slapped in the face by a 30# grouper. I have not had a failure. I can go down to 70fsw hang out for a minute and return on a breath hold. And I can breath free flow, it was taught in Dive School. I tried it using the purge. It sucks but it is doable. My point is I would reccomend an inflator Air source to anyone who is comfortable with it. I like mine it is out of the way and very comfortable to breathe. The one thing I do not like is it does limit ROM. Ya readin what I am writin Scott??? So unless you are cave diving on Acid or punching down to >130' I think it is a great and wonderful thing. Hows that go "Don't dive deeper than you can breath hold out of" JMHO