I had Fishmans in my guitars. Ripped 'em all out and installed K&K's when I heard the improvement a K&K made. Another benefit of the K&K over a UST is that there's no strip inserted between the saddle and the bottom of the slot, so no farting around sanding the saddle down, and no degradation of the acoustic tone of the instrument (although in fairness, that degradation is very minimal indeed if a UST is installed properly).