I've got a 555 in red that is about 5-6 years old now. I call it my speedster bike. The frame is awsome and I was a total convert after taking a mock bike for a ride when I was testing them before purchase. It is a sweet bike.

I can not tell you what the Madones are like because they were way out of my price range. If they are carbon it should be just as good. If you can test ride one of each, then you'll be able to feel the differences between the two. There is nothing like carbon.

Enjoy your shopping.

Red Rock