I agree 100%, a MK2/R295 will last as long as a MK25/S600. ( I hope you realize I never made that assertion, perhaps someone else did. )I agree with the "Beav" to a point. Manufacturers such as Aqualung, Scubapro, Oceanic, and Sherwood usually support their regulars for a long time. There are some exceptions I know, usually the regs that differ greatly from their normal product lines. However, I disagree with the assertion that higher performing regs last longer. A MK-2 / R295 will last just as long as a MK-25 / S600, it just won't breath as well.