SCU5
Contributor
Any modern scubapro second will work with any scubapro first. I use an S600 with a MK11 and have around 80-100 dives on that setup, works like a charm, breathes great.
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The non adjustable C200 and the adjustable C300 are not balanced but the design is exceptionally well executed and offers excellent performance.
If used on a balanced first like the Mk 11, Mk 17 or Mk 25, where the IP is stable throughout the dive, balancing the second makes no real difference provided the second stage is otherwise high performing. The R series seconds were not all that great in terms of quality, consistency or performance, but the C series second stages have so far impressed me.
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The only difference between the Mk 11 and Mk 17 is sadly not restricted to just the sealed ambient chamber - the differences in diaphragm and washers restricts the working range and flow rate on the Mk 11. Still a good reg, but it has the potential to be better if SP would let it be better.
How'd the c300 shake out? Seems like it never gained a lot of popularity.I just posted on Scubapro package strategy - it has nothing to do with what works. Any SP first will work fine with any SP second and the Mk 11 with a G250 or S600 makes a good combination for a warm water diver wanting great inhalation effort in a smaller and lighter first stage than the MK 25.
I am waiting on the C300 I ordered in March - I have played with them a bit but want one for thorough testing in silty/sandy caves, etc. But it promises to be an excellent performing second stage with low parts count, easy maintenance and extremely good reliability at a very good price point.
If that holds true, it would work very well on a Mk 11 for a lot less money than an S600.