I just did a quick tally and it seems like the vote is:
9 in favor of the Interspiro Mk II mask and
1 in favor (or neutral) of the EXO-26 mask
I suspected this would be a fair represenation for what is happening nationwide in the PSD community.
The cheaper full face masks are not received well and many have experienced problems. The EXO-26 is heavy duty and may be overkill for what we need for PSD. It is a little bulky, somewhat heavy and when doing a cost benefit comparison with the Interspiro Mk II mask, most choose Interspiro.
The Interspiro mask has a time proven track record and those that have tried other masks typically regret their decision and often switch to the Interspiro mask. The Interspiro mask has a host of features and benefits including field of vision, ease of service, options which include the "hatch" for breathing ambient air on the surface while the mask is worn by the diver, a "rail system" that allows lights and cameras to the mask, the option to have positive pressure or demand regulation, the ease of adding a variety of communication systems, reasonable cost, good fit and comfort ... just to name a few.
Best of luck with your decision.
Blades
TRIVIA NOTE: The mask was manufactured by AGA many years ago and is now manufactured by Interspiro. Asking for an AGA is akin to asking for a "Model T" as opposed to a "Ford." Technically, these masks are called an Interspiro Mk II mask. AGA did such a good job marketing that even today, people still refer to this mask as the AGA mask.