Feature:
Other then no 1/4 inch outs im very pleased with the features, but I do think that the headphone jack is in a terrible spot. It should be mounted on the front like someone previously mentioned.
Quality:
In my opinion the 500 had better quality, the faders just dont seem to be as durable as the faders used on the 500. The crossfader is also horrible. I like the fact that you can easily replace all the channel faders by simply removing a few screws, same way you would replace the cross fader.
Value:
I think the price should be a little cheaper considering that they no longer make the 500. But what can you do.
Desirability:
This mixer is the bomb, I wanted it bad. But i must admit, Id rather have an Allen & Heath.
Sound:
The sound quality is pretty good, no complaints
Ease of Use:
The layout of this mixer and the 500 are the best I've ever played on, the only better mixer I can think of would be the Allen & Heath.
Support:
I havent had 2 use their customer service. But I heard it takes forever 2 get anything repaired.
Overall:
I plan on using this for a long time.