Dripless Shaft Seals

I am considering changing from the present PSS shaft seal system to the Sure Seal. I am getting conflicting opinions regarding the SureSeal. On one hand there are those that claim that the SureSeal system is much more reliable and a change of seals is possible while the boat is on the water. On the other hand, there are those that claim that SureSeal may not be appropriate for 3 cylinder engines and below because of the  excessive vibration of these smaller engines.
Any experience or opinion on this topic is very much appreciated.

I.J. Perez
S/V Windseeker II C387 #128

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