So I just mounted the thing with some adhesive tape. If I let a note sustain, it feedbacks in the course of 2 or 3 seconds - save for some which have zero sustain. Some notes, like the open G, feedback immediately. I also got some inconsistent crackling (ie. not reproductible at will, at least as far as I know having tried it for 5 minutes just now.) and very unpleasant distortion if I dig in. Also, the volume on the G is much higher than the other strings, no matter how I set the polepieces. Those seem to have almost no effect on the strings volume, and if I screw the G one on the bottom, the pickup either crackles constantly or is just plain muted. I tried mounting it a bit lower, but it doesn't seem to have changed much. I've never had a magnetic pickup behave like this, and this one is supposed to work the same way as an EB pickup... what do you think? Of course, cables and amp are fine with other (electric) basses etc. etc. I'm using Helicores and the bass is a cheap one. My first thought is about just sending it back.