Stopped in at a friend's dive shop today. It's 20+ miles from me so I only get to stop in when I'm in the area. He showed me a ScubaPro Visionaire mask someone gave him. I had never seen one before but I now see that Alec Pierce did one of his video blogs on one. Anyway, pretty neat. Fits over entire face. Second stage is built into top of mask. LP hose connects to top of mask. Inhale through nose and the vacuum pulls the whole glass faceplate inward, triggers the second stage lever inside the mask and delivers a blast of air. Exhale through mouth and air exhausts to the sides. Here are a few pics I took. Mark.