First? I've been playin Low B strings on 5 an 6 string basses since the early 90s. Learning how to string and set up a B string is huge. Back then, it was an art. Today, most instruments and strings are excellent. I play a 5 string exclusively now, for a lot of reasons. To avoid Downtuning my instrument for songs tuned down on records, or sitting in with bands who tune flat. Second, for more range in one position. Less looking at my fretboard. Third, to save my wrists. Songs played in first position on a 4 string's fretboard can be moved to 6th position on a 5. Less stretching, less hand fatigue. And last but not least? I love the power and authority of my B string.