I don't know about this protection system, but so long as the goggles meet our requirements (see below), they should be fine.
Quote:
Eye Protection
EYE PROTECTION is MANDATORY! All goggles and safety glasses must have a hard lens and must meet ANSI Z87.1 standards; ANSI Z80.3 is even better. There must be a full seal around the eyes and goggles must have a safety strap to prevent them from falling off. Goggles with soft lenses and shop glasses without a full face seal are not acceptable. Goggles and glasses with anti-fog lenses are highly recommended. Currently we recommend paintball goggles made by Scott and JT or tactical goggles made by Bolle.
The Web Link didn't provide too may specs, so I would read the box labeling very carefully. Also do they come with ear plugs?
Yes, mouthguards are going to change your speech, but it is a matter of just getting used to it and speaking just a little slower.
I myself use the Bolle' T800 which I think are still available. They have replacement lens. They do have a little problem with fogging when I am lying on my back (which seemed to happen alot at DT5), but that is just lack of ventilation.