I made the jump to 5'er 7 years ago now. This whole never looked back thing confuses me. I still pull out my 4 stringers and have a blast playing them. However, as my main bass, 5 is the only way for me. I love that low D.. Damn sure know I am never far from my 5th string 7th fret. It is usefull, full bodied tone with thick fat low end