caveseeker7:I disagree with Rob in regards to using it with comms, I used it (and the AGA) with both OTS Buddy Phone and 2010 comms without problems. Having the option of keeping the bite piece in your mouth reduces dead space and CO2 buildup.
Stefan knows well of my dislike for the K-M 48 (sometimes known as the "oral sex" mask, for reasons I will not go into on a PG-13 board).
Simply put, however, having a bite-piece to reduce CO2 deadspace is a solution to a problem that does not exist on the AGA. The oro-nasal cup is small, to prevent that problem from occurring.
As for the comms, I would prefer NOT to have a bite-piece to have to shift out of the way every time I wish to speak, or else remove it completely and have lots of deadspace to contend with. On the AGA, I simply push the button and speak.
I have used the Divator MKII (AGA) for many years and found it to be reliable, lightweight, comfortable, and impossible to fog when on OC. (Rebreathers are another matter.)
Cheers!