I haven't worn it yet, but I tried it on.  Thought I would give some impressions.  The mask is very  high quality for the price, behind the rubber exterior is a hard shell that fits over your face, similar to a hockey mask.  It is very sturdy and there is some room between your face and the mask for air to circulate. I have a big head and I had no need to use the optional included self-adhesive padding.  It's not difficult to operate the mouth, you simply open your mouth wide and your jaw powers it. The hard shell gives it structure so the rubber doesn't flop around like many rubber masks do..it's very taut. The hood material is nice and thick, and it also has a velcro closure. I'm very pleased with this mask.

I would recommend that you view the instructional videos on You Tube look for CaliforniaCostumes and the mask name. They have tips on how to operate and troubleshoot any issues.