I was surprised at myself at how quickly I could readjust to playing a 4-string from a 5-string. Maybe from years of playing an upright? It took a really long time for the low B to sink into my thick skull, but once it did, I was hooked for life on those tones. I can now play both interchangeably within one gig, and do on occasion, though most often I will bring either a 4-string fretted and fretless, or a 5-string fretted and fretless along. For most of the music I play, the low B (and the available lower register) work best. I may want to try a high C on another bass sometime, and I actually have one in mind... this old 80's Gibson 'Thunder Series' Bass V that hasn't gotten enough attention lately... perfect candidate. That bass has a cool story I'll have to tell you guys someday.