I've used genx pumps and they are good, but not equal to an Iwaki. My genx is used on a closed loop. If it fails there, it's not a major problem.
If you are using the pump as a main return pump, or it's part of a critical system, go with Iwaki. The quality and availability of replacement parts make it worth it. If it's a non-critical area, the other pumps will be fine.
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