Hey there. I do not have a rebreather at the moment and I am just beginning to do my homework on them. I get to try out one for the first time next week (a Dive Rite Optima II) and I am quite thrilled about that. My main reason for seriously considering a rebreather are the bubbles that are a "by product" from OC. I shoot video and notice how frequently many fish panic whenever I exhale. Plus everyone can tell my breathing rate if I don't have a soundtrack.
I look forward to getting to know this board well and learning all I can about the different rebreathers that are out there. Packetsniffer referred me to here so blame him!!
Cheers