My first bike was a '77 CB500K with a gawd awful Winjammer and highway bars. The bike had 37,000 on the clock, burned a bit of oil on start-up, but it never let me down, and I did almost no maintenance on it. (I was 17 at the time, what did I know!) I got the bike in a straight up trade for a '77 Chevy Malibu with rod knock. Drove that bike about 6,000 miles and then sold it to a minister in from Pennsylvania.
Five great bikes later, i still have great memories of the 550, but I'll always perfer my 400f over it!