I recently bought the 500 at my local shoppe, on a whim. Then I did some research & had them order the Fusion so I could compare. I'm interested in the tube pre & the contour/presence freq switches. It will be a week before it arrives. Anyone care to share their opinions? I've seen several threads that date back to the days of the Fusion's release, but most of that is hype. Hands on experience, please. Although general expertise is always appreciated!