Well, I gigged with the Fender flats (40, 60, 80, 100) on the JB2 last night and they sounded great. Lots of punch, presence, and easy on the fingers. Even the drummer liked them, and he's deaf as a stone. Interestingly, they were perfectly intonated once I put them on and the tension was about the same as the pro-steels. Really pleased with the results.
So many basses, so little time.