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If this was directed at me I belong to a SAR team thus the diving with 
AGAs and com gear.  Although i find it much more comfortable than a 
regular mask under the ice this is a personal preferance and not a 
requirement.  I also use an argon inflation system with my drysuit.  
this is also personal preferance.  I find that i am alot warmer in a 
drysuit than in my 7MM wetsuit and thus more comfortable and able to 
dive in a more relaxed less stressed way.  I can dive in a regular mask 
and wetsuit but when the gear and training are available to make the 
dive more comfortabel why not take advantage of them as long as safety 
is not compromised.

STEVE  
>The use of AGA's or other full face masks for ice diving is 
contraindicated on SCUBA except for SAR 
>or other working dives.  Statistically, the low temperatures 
encountered while ice diving 
>frequently cause freeflows in FFM's, and this risk need only be taken 
if comms are required for 
>safety or objective related reasons, or if the water is contaminated.  
This is why I recommend the 
>use of tethers, as it permits line pull communication with the surface 
for divers using a standard 
>half mask.  Warmth of the face is a poor justification of these 
devices.  When using the right mask 
>and hood, only the upper lip and corners of the mouth are exposed, 
which will avoid frostbite or 
>any tissue damage by metabolic heating for any reasonable dive 
duration.  Reference posts in the 
>archives by Rob Robbins (US antarctic diving program coordinator) on 
this stuff.  Water temp in 
>McMurdo get to -2 C, and they dont use the FFM's.
>
>-Sean
>
>
>
>
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