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I've been told by people with WAY more experience and background than me that the Apeks second stages are modeled after a Scubapro design, but the Scubapro sealed diaphragm first stages like the MK17 are modeled after an Apeks design.I'd go with the SP. The Apeks is a copy of it. I have many older G250's and also 2 ATX 200's. Both are great regs. SP seems a little better to me.