Fantastic! Very nice huge field of view. It is very useful for diving because with the side windows (because they are angled) you can look at your Buddy while he/she is <100 degrees away from you. That means just the way you go straight, without moving your head at all, you can see him/her on the side and further back!!! This is very convenient for safety and to always have him/her easily in your field of view even if he/she is on the side!
The only advice it needs is that because the silicone is bad, don't squeeze it, because it gets compressed and will let water in! Also, a little bit of Vaseline on the mustache just before the dive would be ideal