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I own both a Mares Abyss (MR22) and a Scubapro MK15 with a G250 second stage. 
 To this day I still cannot decide which I like more. I use both equally, I 
dive twin independant tanks and each tank has one of the regs.  I don't use a 
manifold, so I am constantly switching between the two regs. every 500psi.

My suggestion is; you can't go wrong with the Abyss its a fantastic 
regulator, its a great breather at any depth (NEDU class A succeeder).  As 
for servicability and parts, I live in Ottawa, Ont. and have had no problem 
getting parts through Burtons Dive Service, or Plongers du Gatineau (Gatineau 
Divers) in Que.  By the way when I say parts I mean things like a cold water 
environmental seal kit, and the Regulator itself as well as other Mares 
Products (ESA Mask, Flat Brass pressure guages, etc) If the Items are not in 
stock, then it could take 3 weeks or so.  the reg. itself is a Super Tough 
workhorse and has no external adjustable parts, I can't imagine something 
going wrong with it.

Here's an incident where the simplicity and superiority of the Mares paid off.

I was diving a Mine in Buckingham Que. (Back Mine) I started the dive on the 
Scubapro, at the cave entrance at 110 feet I switched over to the Abyss, 
grabbed on to a permanent line and began my descent.  At the end of the 
tunnel at 173 feet I replaced my Abyss with the Scubapro, this is when the 
surprise happened.  The moment I sipped my first breath from the Scubapro I 
was overwhelmed with an incredible on-slaught of bubbles as the reg instantly 
began to freeflow violently (I didn't have the adjustment screw properly set 
for that depth, the depth at which I it was set was 60+ feet above me.) I 
couldn't see a thing in the blackness and bubbles and the sound was 
deafening, it was quite a shock at 173' on air.  Not sure at the time what 
was going on I switched back to my Abyss, regained control of my thoughts and 
examined my Scubapro which had stopped freeflowing as I quickly tightened 
screw and flipped down the flow vane. After checking my air situation I began 
a hastened return to the surface, I had lost about 1500 psi in the Scubapro 
tank that I was counting on.  Fortunately my tanks are separate and I was 
able to get back safely thanks to my Abyss and Aladin Pro Computer.
Now when I switch off of the Scubapro I fully tighten the adjustment screw 
and turn down the vane before switching, when I come back to the Scubapro I 
readjust it for the new depth.  Just one more step to keep in mind ( it now 
comes naturally ).

In fairness I must say: when optimally adjusted, the Scubapro is a better 
breather at greater depths.  Slightly.

Mike Sandler

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