Was in a sporting goods store today and took a close look at the Abu 5500's and the 6500's. I've a 5600 C4 that I use for catfishing, which is, I believe, the wide spool version of the 5500. When I compared the 5500/5600 reels to the 6500 reels, the main difference appeared to be more line capacity in the 6500. The 6500 appeared to be able to hold more line and, therefore, bigger lines. Am I right, is there also a difference in the way these two series are built internally? I'm satisfied with my 5600, but will buy a new reel probably next year and tend to think long term when I look at what, for me, are major purchases. It took me 6 months to decide on the 5600. Of course, I didn't know about the Brotherhood back then either.