I only have one 5 string and it’s the Rickenbacker 4003S/5. I had tried a few over the years and never cared for them much, and since I’m very comfortable with the use of a Hipshot extender, and have them on almost every 4 string bass I own, I didn’t see the need. Most of them had a dead sounding B anyway. The Ric 5 has what feels to me is a perfect size neck and the string spacing is really close to my ‘70 Jazz, so it works for me. Also with fresh rounds on it, it sounds close to what you would expect a typical 4003 to sound like and even the .130 B has a good ring to it.
All that being said, I rarely use it. lol.
The last time I used it was to record parts in a yet to be completed recording of a new Bad Lemon song. Just playing part of the main riff at the lower octave to add a cool effect, naturally, instead of using a pedal.
I’ll likely keep it as a tool, but if I ever actually find the need for the low B in a song that would be played out regularly, I would probably just make a 65-125 set up, put them on my ‘bird that is normally used for D-Standard and drop C and tune it to BEAD.