not familiar with Mares products but I have dove with and without the i3 before and I really prefer a BCD with i3. Very streamlined and easy operation....pull up you go up...push down you go down. No hose to fiddle with.
IMO...it is where all BCD technology should be headed.
I agree. Still haven't received the BCD yet though. Hopefully it arrives soon I need to get into the pool to try it out.