I bought a fiver as my sole bass back in 1989, back when I owned one bass at a time, and playing rock/metal stuff it was handy for drop tunings and big rumbling riffs under the guitar parts. Having got used to it I've not bought a 4 since. It's really proved useful over the past few years as I work with a mandolin player with a broad baritone voice. The mandolin is quite high, his voice takes up a large amount of the middle ground, and I find that working in the really low end helps keep out of his way.