When playing with the HD2 tonight I ran into some issues:

At boot:
Black screen for 10-30 seconds (probably because of the auto-scan of the 2TB HDD), it even looks like it hangs.
Tip: Maybe a message like "Scanning HDD for new content.. Please wait, this could take some time.."

Settings menu:
Wrong Tiptool info; it says you need to use << and >> for changing categeories, in fact you need to
use the chapter buttons.

Poor response of the remote:
I don't know if it's the remote or the HD2 itself, but after giving a command through the remote it
takes about 1 second for the HD2 to respond and execute the given command.

YouTube:
After login to YouTube and accessing my 'YouTube Profile page' where I can view My Videos or Favorites it gives me a NETWORK_CONGESTION when selecting an option.

ShoutCast:
When downloading and processing the stationlist it 'hung' for about 2 minutes before it even responded.
Also several times the 'list' was empty, this occurred in the 'Stations' section and the 'Genres' section.

"Auto"-scan
It seems like auto-scan only scans at boot. Today at 14:18 (2:18 PM) I added a video on the internal HDD, went shopping (since the upload takes like 30 minutes because of the "gigabit" Ethernet connection ) and when I returned after about 4 hours the new file wasn't listed in the Movie/Video section.
It should've had enough time to re-index the entire HDD (2TB) in the time I was out, maybe a scan every hour or when idle should be implemented?! Since 'auto'-scan isn't living up to it's name...
Maybe it does work, but isn't indexing subdirectories (which it definitely should!).......

Feature request
I use a folder structure like:
But in the Movies/Video section ALL videos are displayed in one big list.

Is it possible to add an option to use the Folder names as a 'Filter' of some sort?
So when I select the Movie/Video option in the main menu it will automatically display "Films" and "Series" and I will be able to navigate through the subdirectories?

Any feedback on DaRKoNe requests from AC Ryan Staff would be appreciated!!!

Totally agree on these parts, I've just got my HD2 and been compairing it against the old HD1 with the old gui. Both remotes work perfectly with the OLD gui and there's no delay. But using both remotes with the new HD2 on the GUI 2.0 (v9.5.3.r2073) the remote's are very sluggish.

The boot is very slow - but think that's because of my 2TB hard drive, though I have found I've had to reset the HD2 everytime I disconnect the HD2 from my pc as the main menu doesn't always load up fully and only shows recently added music.

Tool tip did get me confused on the new GUI 2.0 as I was sat there pressing the forward and rewind buttons and nothing worked, but when using the chapter buttons it was working.

I was wondering how long it would be before we would have to wait until these fixes would come out, as this is the first release of firmware for the HD2 - 23 days since the launch of the first one.