Vie:May I ask why?
I like the hose routing of the Apeks better. Also, the Mk25 first stage hits my head, even when my tank is mounted as low as possible. I can't turn the 1st stage over to have the post pointed down since it covers the same space as the inflation hose of my wing. And even though I don't dive in terribly cold water (45°-50°), I like the peace of mind that comes with diving Apeks in the winter months based on a few reports of freeze ups with the Mk25 in cold water. The adjustability of the Apeks 2nd stage seems better/more to me. The Mk25/S600, even when the 2nd stage is adjusted to it's lowest flow, seems to almost inject air into my lungs, whereas the Apeks is as close to taking a normal breathe as I have experienced with any regulator. I can adjust the Apeks to "inject" a large quantity of air, but can also adjust it down to a more normal level when wanted. I experienced this "injection" with my SP at all depths down to 120'. I know the Mk25/S600 is one of, if not the highest flow rate regs on the market. It just seems to be a little too much to me. Others might have different experiences with the Mk25/S600, and the new Mk17 might be a different animal all together, but I just do not like the Mk25/S600 setup.