I had a nice 5 that I liked a lot overall but the string spacing just bugged me. And that’s after adjusting them for width. I just didn’t like the feel with the strings slightly closer together than on a 4.
Everyone should try one though. Don’t let the huge fretboard scare you - if anything it’s easier to reach the EADG strings on a 5 than a 4; the strings are about 2mm closer together so you cut over half a centimeter off the reach for the E string with a 5.
I strung one of my 4-strings in BEAD tuning using the low part of a 5-string set for half a year and that was awesome too. One thing I noticed with the 5 was that for the music I like to play, it was really rare that I would need the range of the B string in any song that used the G string at all. And sure enough, with BEAD, I never missed the G string. Gaining those five semitones on the low end made up for losing the five on top. Cool tuning.
But in the end, I found myself pretty satisfied with just going to drop D instead. And a lot of songs in Drop D are easier to play in Drop D than in BEAD(G) - which makes sense when you think about it, the person that wrote the song was fingering it in Drop D, so their natural choices often translate better to that tuning than to having the D string shifted two frets back to “normal” tuning, even with the B string being there.