[1 of 1 customers found this review helpful]
The HD lens, which are thermal, that comes with the mask is really nice. I was going to buy a thermal lens of some sort, no matter what mask I bought, so it saved me some money... despite the price tag. The tint of the lens had me a little worried, but it's actually really easy to see through. After about 5 minutes of playtime, you forget that they're orange at all.
The mask itself is a really snug fit to my face and extremely comfortable. It's hard where it needs to be, but flexible near the jaw line to help with bounces. Some masks do a poor job with their foam, but not the I4. The foam is perfect(At least with mine.)
The venting does it's job with both voice projection and breathing. I haven't gotten a response of "What?" yet.
The two downsides that I have about the mask are 1. The lens's locking mechanics are a little stiff starting out, but I'm sure the tabs will become easier to lock and unlock as time passes. 2. The mask is almost too small. The very edge of my chin and jaw is visible if I'm not careful with positioning the mask. It's supposed to be low profile, though. I hear a larger version is going to be released the first quarter of '09 for the players with larger heads. Cross your fingers!