Ooo.. interesting.
I have the 02 2.1 ROM on mine and it works.. just that the proximity sensor is out of wack and if I put it in the sleeve or my pocket, it reboots my phone.
mine isn't exactly a ROM. I literally took the O2 update.zip, put it on my phone and applied it. Then messed around with the files in the system folder(build.prop) to make it appear as a US device.. works great aside from some apps saying I'm in the UK lol..