I've been playing "normal" five-strings for about 15 years, and I've always been able to switch between a four and a five without issue, as I think most people can. I've owned one six string so far, a fretless, unlined Warwick about 10 years ago. It was too much bass for me at the time and I never got used to the C string. Recently, I've switched one of my 5-string Stambaugh's to E-C tuning and it only took a few days for the C string to start to click, but now switching back to one of my B-G fiver's seems foreign and clunky. I want to put more time into getting the C string down and I think it would open up lots of stuff for me melodically, but I can't start getting clunky with the B-G fiver as that's what I play all my gigs with. Fours and fives "feel" different, so mentally it's easier to switch gears for me. Has anyone else experienced this? I know with enough practice anything is possible, but I'm curious whether many people have both E-C and B-G fivers or whether they stick with one or the other, or if most people end up going to a six.