tom_guy
Registered
There are many reasons as I'm sure everyone here will tell you but the big one for me personally is that DIN valves capture the tank o-ring and therefore prevents the "burst o-ring situation" that happens sometimes to yoke valves. There are other reasons but that one is enough for me. As a side note, more and more tank valves can be purchased with a yoke/DIN adapter that can be screwed in/out with a allen wrench so you don't have to throw away all your old yoke regs.
My girlfirend recently did here OW course and had a blown O-ring. Looking at buying my own equipment in the near future I might invest in DIN regulators.