I've got a few of the 5-string version in my parts drawer. I haven't done anything more than a "tap test" with a metal screwdriver to make sure it worked. I am expecting they will not be too dissimilar from other Delano "HE" series pickups, which have great midrange and a very crisp treble. However, I have not yet carved a new route in a bass to hold the oval pickup. It's on my list of projects to do.