I Have a Xenon with XBR 01... tried several Arcade and Full games.
Every Arcade worked, except TrialsHD, which has "ingame" a veeeeery low framerate (0,0000005

.
HL-Orangebox: works fine, but sometimes crashes at the Gameselection screen.
ResidentEvil5: doesnt go ingame, i see the videos and everything but at the point where the games should start the screen just stays black.
Sega Ralley: wont start, patched the XEX but it still reports that the disc has scratches

PS: patched all games with X360GameHack, games run from 360 HDD