I recently purchased a 3310 from Electronic's Expo--fast shipping and very good price.
I have been trying to get things set up. Having used Onkyo (most recently a tx sr 702) products in the past, adjusting to Denon is taking some time. First as has been stated by others, Denon's remote controls were designed by idiots. I purchased the Harmony One and have been pleased with it.
When installing a firmware update, my 3310 froze and became a brick. I thought that I was going to have to send it back since I could not get the unit to respond to the remote or to the buttons on the receiver. So, I started messing with the receiver via the network connections, which allowed me to reinstall the firmware from my computer. Thus, anyone with a locked up receiver should consider using the network connection to reinstall firmware.
Overall, the sound of the Denon is fantastic--must better than the Onkyo. But, this unit is more powerful and more advanced than my old Onkyo unit. Plus, the Denon does not run as hot as the Onkyo (I could fry bacon on that thing).
However, figuring out how to change setting in the Denon is not intuitive. And, yes, Denon's manual is awful.
I really like the network set up on the 3310 because it allows one to play music stored on your computer. The interface using a web browser can be a little slow at times, but it is cool nonetheless.
Overall, I am happy with the 3310. Denon could have done a better job allowing user flexibility in setting sound processing modes as defaults or perhaps I simply have not figured out how to make such setting.
BTW: As a plug to batpig, your website is very helpful.