Ok guys, let's talk about reliability.

In preamble, let me apologize in advance as I am not at liberty to release thorough statistical data because I have to respect the factory directives on the subject matter. So please read between the lines on some of the basic facts below:

90% of the pumps that we receive in RMA are not defective (we test every single one of them).

There is little if no difference in reliability between D5 (MCP655) and DDC1 (MCP350), and the number of actual failures is incredibly low (far better than any other pump manufacturer IMO). Stupid mistakes like inverting the wires in the D5 Molex connectors is arguably not counted as a failure.

Yes, one can normally expect somewhat less reliability from a pump that spins faster and heats up more (DDC2/MCP355).