Unfortunately the Flowkooler pump seems to just be a standard parts store pump that they have put a fancy impeller onto - I have gotten not one, but TWO that were bad straight out of the box with what felt like gravel-filled bearings. I would suspect that if other pump castings are seeing failures like this, the Flowkooler would be equally susceptible.
I use a cheap repro pump that was made sometime during the 80s and appears to be much higher quality than the new ones sold today. I had it rebuilt a couple years ago with an original HiPo impeller and brand new top-of-the-line bearings and it cost me less than $100... so less than a brand new Flowkooler.
Hmm...makes me pause. I'll talk to Mark and see exactly which WP he has.