Hi jabbok,
Actually, I had not realized the Mares was on sale, until I saw the link Stu S. posted.... so now I'm not as certain
I love our Mares regs. We have:
2 MR-22 Abyss, 3 MR-12 Proton, and 1 Mares MR-12 Voltrex.
The Mares regs have balanced diaphragm 1st stages, and unbalanced "classic downstream" 2nd stages. They are simple, reliable, easy to service, and perform very well.
A lot depends on
where you plan to have your regulator serviced. Any decent reg technician should be able to service either of these regulators easily, as long as the parts can be obtained.
Will you be taking the regulators to a local shop for service, or mailing them away for service? That might be something to consider. If you plan to mail the reg off, then your choices are unlimited, if you plan to have the reg serviced locally, then your choice may be limited to the brand(s) that the local shop is willing to service.
Best wishes.