I will abandon this reg soon. Hard breather at depth. I bought it because of weight and size, but the hard breathing is a show-stopper. Have used it on approx 30 recreational dives and my dive times are shorter and I am more tired after using it.
This isn't just me, I work at a dive shop and another PADI instructor bought one at the same time. He couldn't wait to return his. We dive in Jupiter,where every dive can be 80 +. We both felt we were breathing too hard to get air. Apeks states Flight has been tweaked since then, but don't know. We are on commercial dive boats almost everyday, but am not seeing any of the Flights yet.