I bought a Verizon one in the US last month for the UK (Vodafone SIM). Works fine except you can't save MMS settings (MMS won't currently work), tethering is disabled and I'm still waiting for the latest Portico update.
If you do get one, make sure you turn off the international assist in call settings! Without disabling that, I couldn't send any SMS as it tried to prefix all numbers with a 0011 or something.
Personally, I think I should have just bought one in the UK on pre-pay for the same price from any high street shop (Computer Exchange in Crawley even had an unlocked HTC version for £350!).