If you put all the divers who like purge valves together in a room with divers who hate purge valves you would start a riot. The problem is not purge valves. The problem is nobody makes a decent design.
Back in the 70's and 80's was this design of a flat piece of glass with a purge valve which stuck out front. The nose pinch was behind the valve built into the rubber. The design was fine, but fell out of favor because it looked ugly; called the "pig snout." Newer designs pushed the lenses back, reduced the volume, and improved peripheral vision. One gotcha - a protruding soft nose pocket became the standard. If you wanted a purge valve, it went into the nose - or up your nose and/or prevented you from pinching your nose. It's a bad design.
This design is the best of both worlds. Now you have the customary nose pocket back, but it's not really a nose pocket. It's a purge valve pocket - stylish, functional, and does not interfere with the nose pinch. On my face, I can pinch my nose easily and it makes a great seal.
I will be buying a second as a backup. Great design with a strong solid tempered glass with peripheral vision and a purge valve which doesn't look like a pig's snout.
