Kim (my daughter) has wanted to dive rebreathers for several years. Now that she's 18 I've got her in one of my Sport Kiss classes. She did her first few hours on the unit at Weeki Wachee yesterday. Near the end of the day I took a few photos:
That manatee on the bottom is just like a puppy dog. Being able to hang out like that with no bubbles certainly seems to be an advantage.
I have thought of learning more about the Sport Kiss certification for the type of diving I like to do. I will contact you through your website; as you are quite close to where I live.