I have 5 MK25s/S600s. It is not that I need that many but I just do not want to keep changing my hose configurations on them. I have one configured for Yoke single tanks. I have two configured for DIN for backmounted doubles. And I just bought two more to configure for either DIN or Yoke sidemount systems. Now a days I live and primarily dive in the tropics but I have used them also in 1-3 ft vis in Dubai, Colorado and Seattle and in waters as cold as high 30s. Not once have I ever had any issues with them.
I also have Sherwood SR2s, Atomic B2s & Z2s and Aqua Lung Titans. Out of this bunch I would put as much faith in only the Atomics as I do my MK25/S600s. I just bought two MK17s/G260s for stage tanks but have not dived them yet.
So to J_Gig89 I say you are making a great investment in your regulators...If you can afford a great tool than buy a great tool.
I have the same opinion as you do with a lot more experience with SP, Atomic, Mares, AL, Sherwood, etc. regulators and nothing compares to Atomic and SP in performance, dependability and reliability. My experience and opinion are not only shaped by my own experience with regulators but is also based on using these regulators for our dive school's equipment fleet in addition to other testing and research with other agencies. My experience spans diving in the Northeast US (Maine to NJ), many parts of the world including Libya on the southern coast of the Med.