I've had my 520 since last December. I've used it for commuting, training and touring. With my B17 Champion saddle, I can ride all day without discomfort. I replaced the original crankset with the Shimano Trekking set. (Note that the Trekking Cranks also required a different bottom bracket). I also had to replace the original tires and so got the Panaracer Pasela's, which, even though marked as being the same size, were considerably smaller than the original Bontrager's.

I like my 520 so much better than my CF road bike, that words fail me. It just feels good. The only drawback is that its slower than my CF bike.

I hope you enjoy your 520 as much as I enjoy mine!