||I haven't yet had a problem with the batteries dying. It was used on "high" for about 4-5 hours one day and about 6 hours another day. Still alive and kickin'.
Mask is *very* flexible, so you can use optics VERY easily
nice wide range of view
obviously doesn't fog up cause of the fans
mask is detachable if you wish
battery compartments pop open sometimes, especially if you have it decently tight around your head
I received mine with the lenses scratched and the wires inside the battery compartment were disconnected. I had to solder the wires back in.
I gave it 5 stars because hopefully the problems I had with mine was just a fluke. However, if you need to solder the wires back in, don't worry. Soldering irons are only like 2 bucks at walmart. 2 minute fix.
Rating: [5 of 5 Stars!]