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Yes, it was used in a 25" f5 without coma corrector.
Being aware that no eyepiece (other than the pretoria) corrects for coma, i understand the nature of the aberrations visibile off-axis. With respect to the Nav; if there was any contribution to the comatic plume inherent in to a Newtonian of f/d=5, it was in no way obvious.
I would have to inspect the field aberations of the NAV in an anastigimatic OTA to venture a judgement wrt its overall correction.
My gut feeling is that it is very good.
best
~c
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