First test...
copied over Soul Calibur 4 game to run off hdd
Also copied over locked darth vader costume DLC, a few more XBLA games, and pre-unlocked Pinball FX DLC.
It's worked champion unlocking darth vader DLC

Also....I had 2 usb devices connected, USB0 and USB1. USB1 held xm360 on it which I ran it from. USB0 was the main hdd holding 360 games etc.
I connected the USB1 hdd back to the pc, and there was no report file.
But I checked afterwards the USB0 that was still in xbox - and it has put the report file onto that drive instead but at least its working, and listing the missing XBLA titles and currently have titles.
Any possible way to keep the report file to the same hdd it was run from? Other than that can't seem to fault it - interface is still quite tidy.
Was pleasantly surprised to see the indie games stuff listed too - which unlocked the Kodu Game Lab I had on there - though I see that game refuses to run anyway without being signed in to live..doh
Be interesting to see what happens with Forza DLC though I need to find out the best way to get that copied across (ie - how/what to do with disc 2 - presume prob just case of copying over cd1 to usb hdd, then letting the installer install disk 2 straight from CD? Unless a way to have it auto load the files from the disk 2 folder on a usb hdd?)
Also, with Lips, I'll start it copying over soon, and getting a couple of DLC tracks added and see what happens there, and look into that XML file thing that I read was needed. As far as I recollect I think people were only managing to get them working on Lips Number One Hits and not the standard Lips....and could get them to show up, but having hard time getting to play without the xml or whatever file it was associated with it. Maybe if the format of the xml creation is the same it could be set to be done from within the unlocker too perhaps.