i have the carbon 42 it is a nice easy breather and yes you can dive nitrox out of the box nitrox to 40% as is the case with the abyss but if you want a small reg the mares proton metal is smaller than the carbon 42 about 50 grams more weight cost about 1/3 less both are good cold water regs as is the abyss. the proton at one time was marketed as a proton extream ice with the older v32 first stage. the new proton metal comes with the mr42 and a cold water kit can be added. where in canada do you dive.
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