I have still the set of DiMarzio Ultra Jazz I replaced with SD Hot Stacks (which I like much better) on my fretted Jazz. I just got a Squier Fretless VM and love it but I was wondering what's in the guts of these "Duncan Designed" pickups? I did not get any buzz when isolating either pickup, I would suspect they are buzz canceling, but they look very cheap. They do sound ok. Especially the neck pickup, it helps getting the very distinct fretless twang. Do you recommend I try the DiMarzio Ultra Jazz? I mean, it's only one hour to do the swap, MAXIMUM, but I was looking for a feedback prior to doing it. Thanks!