Mares has a bad reputation sometimes for service and warranty. Nonetheless few regualtors will breath as easily or be as durable as their metal versions. I have several Mares products that have proven durable and have stood the test of time. My next regs will be the Protons, it is a small, light, simple, super performance regulator, decent price and excellent durability.
It seems the tech guys like the Apeks and the Zeagles and I believe that is mostly beacuse both are good quality and they provide parts to the field, ie, you can get hold of the bits and pieces yourself.
Given that most dive equipment made today is near total junk, hats off to the few companies like Apecks, Zeagle and yes Mares that still produce professional quality products. N