I have a KF4 but without the P3 connection, and it is essentially impossible to get the P3 connection part in the US (I don't order from China). Besides that the KF4 is way over engineered with lots of complexity. If something can go wrong it will, and has with the KF4. To much fiddling for me. The Subtank mini has much better engineering. It is simple and it works.I have an STM, but I'm not crazy about it.
So if I want to use the P3 connection I'm stuck with the nautilus. That's not going to happen as I can't do rebuilds with it.
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