I have 2 5ers now, but I really would like to get a 4 for certain songs where I need to slap (I'm not very good at it and end up hitting the B like crazy). Still, the 5 is the ultimate for me, gives me all the options I need. As someone else said, I'm in a band with two female singers, and we do so many covers that aren't in the original key, it makes it so much easier to have that B string!