Well, I got my 1610 yesterday. I have to say, this UI sucks and there are much fewer picture controls than my Pioneer 51. Right now, I definitely prefer my Pioneer. However, this player is faster and the disc tray open/close is much quieter. Right away, I updated from 1.006 to 1.008. NO SD CARD NEEDED. I never put one in the player. So, the main reason I got this player is that it has Source Direct, since I have a VP. I moved my Pioneer in the bedroom cause I have a 2 channel analog setup in there and the Pioneer has awesome analog audio. I'm glad to report the Denon plays PAL just fine. However, I wish it were SD DVD region free, like my Pioneer is (remote hack). I didn't even bother with upconversion, since I use Source Direct to my DVDO Edge. That's why I got the 1610 over the 2010. Oh, and the "Pure Direct" mode is neat, you can turn off the front player display or you video section all together. I just turn the front display off.
To check firmware - 1,2,3,4,display - somewhat quickly. Read that in the 2010 thread...
All in all, it's a nice player. I do prefer my Pioneer 51 over it, but for the price I got it, I am happy. It's nice to have matching AVR and BD player now.

Denon - PLEASE add some more disc info to the Display screen! Wow...