I service them myself. In fact, the spare reg is simply to get me into the water without delay. I have tools and service kit in my save-a-dive kit. These things (Scubapro Mk 10 and Balanced Adjustable/G250) are so simple, that you can service them during a surface interval.Just out of curiosity--don't think I'm ready to go that far with redundancy just yet--for those of you who carry spare 1st and 2nd stages, do you get those serviced at your local dive shop as often as you do your primary regulator set-up?
rx7diver