I've had a BP 100 upright bass pickup for several years, and I could never get a consistent tone from it. I sent an email to Gollihur Music and listed all my gear, music style I played, amps I use, and then asked for advice on a pickup. The reply was that a lot of folks were happy with the Realist Lifeline, including one of the Gollihur owners. I promptly ordered one, and it showed up in about four days. I installed the unit outdoors while at a festival, and it took all of 10 minutes or less. The tone of the pickup is the high point of this review. It's thick and full with good string balance. I've only had it on my bass a few days and so far I'm very pleased.
Realist Lifeline XL
Upright / double bass pickup