DA Aquamaster:
I could be reading this wrong, but Taliesin is asking about FFM's in the PSD forum but is not a PSD diver - so whether the AGA is the best mask for the (PSD) job or not is irrelevant.
Like I said, the AGA is the AL80 of the PSD world and that unfortunately gives it a lot more status than it deserves in the rest of the diving world.
Well, DA, you ARE reading it wrong. Taliesin came to the Public Safety Diving forum because, as he said:
Taliesin:
Hey, you guys are the pros & I'm sure a lot of you go the "full face" route, so I thought I'd get your opinions before I headed that direction.
Obviously, you come to our forum, and ask us what we use in our jobs, and the answer you get (largely) is the Divator Mark II, colloquially known as the "AGA" because of it's history. So no, the answer is
not in any sense irrelevant. If he had not wanted the opinion of the pro's, he would have gone to the General Scuba forum.
As I said before, the AGA has earned its place among professionals in the PSD world by being a damn fine mask. If fits a lot of people well. Because of the airflow pattern, you cannot fog it up, not that that matters much in PSD work, because we normally can't see a damn thing anyway!

It is rugged, is in such general use that spares are readily available when it does need repair, and works well with comms.
I cannot argue with your contention that there are cheaper FFM's on the market, and they seem to work well enough in most cases for recreational use. That is one approach.
I also cannot argue with your dislike of switch-blocks for gas switching in technical dives. Setting the switch to the wrong position seems to be an all-too easy mistake to make, and the result is almost inevitably fatal.
Still, as I said, the M-48 "oral sex" mask is not cheap by any means, and quite a few people find it clunky and uncomfortable. Its use is not necessary for gas switching. That can be done as easily with commercial large-bore locking quick disconnects, thereby offering a more positive control over the "switch" while remaining on your FFM. Truly it is a case of "Chaque au a son gout, monsieur!"
Still, you may well be right, both the AGA and the M-48 may well be overkill for Taliesin's needs, and he might well be served by a lesser, but much cheaper unit. I will reiterate my advice and that of the others here who suggest that the man to steer him right will be John Hott of Ocean Technology Systems.
Here:
www.oceantechnologysystems.com
Truly, as the Brits would say, it's a case of "Horses for courses." Or as Mr. Natural used to put it: "Get the right tool for the job, Kids!" :doctor:
Just my ppO2's worth, YMMV!