I sold my five string upright bass a year ago and do not plan to buy another one again. Keep in mind I blended the Biesele with a Full Circle pickup for my main tone. When I played with the bow I would mute the Biesele because it does not amplify the string vibration when using a bow. No magnetic pickup does this.
Here's another song: https://www.youtube.com/watch?v=kItU...UoMzc1U8z97aKc
What the Biesele did for me was give a consistent and sustained tone for playing in louder situations where you would normally use a bass guitar. The piezo pickup would give me the initial "thump" to my attack, and then the Biesele would sustain the note longer and stronger like a bass guitar would do.
There would have no way to play that loud and sustained with just a piezo pickup and not have a feedback freakshow.