I agree with adding the venting on the sides.... The problem with them is your exhaled air just sits there behind the mask. It would not be a big deal if the mask was not so close to your face, but the combination of less venting on the sides and it being closer makes it very hard to breathe... I was using them today and was having problems breathing in them, then I switched to my old JT Spectras and had no problems breathing. I think I may add some venting to the sides...
"Let them hate, as long as they fear"