Well, I picked up my first Rickenbacker today, and I was absolutely blown away by how amazing it was. After relishing the time I had trying it out, I went home to research it, and identified it as a 4001 C64. I've seen and heard about a lot of Ricks, but I figured the Rick-ficionados on TB would be able to explain this to me: What is the difference between, say, a 4001 from any year and the C64? Looks are one thing, I want to know what the tonal differences are. Rick owners, you are a lucky bunch.