What suprised me about the Monark nozzles is that when I pop-tested the injectors I found that all of the spray nozzles were uniformly good. My experience with Bosch nozzles when I worked if a fuel injection shop was that in a set of Bosch (all German back at that time) nozzles is that some would be good, some middling and some very marginal and the most would not make that chattering or squeaking that excellent nozzles make. Bosch actually changed their specs back then to say that their nozzles no longer had to make that sound (which is one of the indications of how well the pintel is seated in the nozzle) as long as the nozzle seats passed the leak test.
So I would not hesitate to get another set from Sean C Watts if I needed them.

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84 300D, 82 Volvo 244Gl Diesel