I traded for a 55-01 and a JO5 last year. To my ears, the JO had a tone I liked better, (I'm more of J, rather than P, guy) so it has been my main player, with a few exceptions. I like the 55-01, but my thoughts were that it was a bit tame compared to the JO. A week ago the JO strap screw on the bottom came out during the last set. I was very busy the next day and forgot to try and repair it. When it came time to go to the gig, I realized I didn't have time to repair it, so I took the 55-01 for the evening. I was very surprised at how it sounded at volume and in the context of the band; clean, wonderfully even and rich sounding. Tones easily tweaked with the preamp controls on the bass. I like it enough to keep using it for the next several gigs to get a full assessment. The drummer and gp both made positive comments. So, my question is what experiences do you have regarding evaluating the sound of a particular bass in your room and then within band at volume? Stories please.