Joseph, I haven't tried the Neofin Blue, but have used PMK pyro with Efke 25. I have found it to be a good combination and would also like to hear about others with some experience using Efke 25 and NB. Curiously, both have metol as an active ingredient in part "A" so I'm sure there will be some similarities, at least with respect to agitation.

PMK works very well with Efke 25, but temperature and agitation both have a pronounced effect with respect to contrast and therefore need to be consistent from batch to batch. The grain is very fine with this developer, so I can tell you that it is a good film - developer combination to work with, especially with rollfilm and small size negatives. Hopefully, someone with some time using NB can tell you about it.