can anyone elaborate on the 10 vs. 10+?
The 10+ is technically rated for moderately higher pressure and better cold water performance. I use yoke standard Mk 10s to about 3500 lbs without any problems, and standard Mk 10s are used without issues to temps down in the 30sF. According to some people there are IP issues with serviced or rebuilt Mk10+ regs, but I have no direct experience with them.