I was gifted one last year. I tried it out on one snorkel during our spring trip. Did not like it at all. The visual part was OK, but really a lot of the peripheral was distorted by the bend in the plate. As was noted, there's no diving down. Breathing was more work than normal, not bad when going slow, but wouldn't want to get in a current situation where I had to work harder. Also, a lot of heat build up. My face was sweating. Having said that, I know a lot of people love them and swear by them. I was due for a new mask anyway, and was able to exchange at my dive shop.