Spent a ton of $$$ on two Neptune Space FFM with DC coms. Also bought a M-105 Digital Transceiver Surface Unit as well. We dove these masks 4 or 5 times and are not the least bit happy with them. We are firefighters and are all too familar with FFM operations. We also dive at our local aquarium using a competitors mask and have had no real issues with those. Anyway, the ammount of effort to crack open the second stage is unsatifactory as is the "chatter" upon inhalation at shallow depths. The surface unit performs very well and the com units will suffice. I have not had these masks serviced or adjusted since new. Figured after spending $3K the masks they should be somewhat acceptable out of the box. Please somebody help! I hate to sell these for pennies on the dollar but I am at wits end with these masks. I guess I will find out first hand what kind of customer service Ocean Reef offers.