Music plays as fantastic as ever, only calls seem to be affected on BT. I dont know about the UK phones, I have only heard about the US phones on ATT. As was mentioned above, keep an eye on your 14 day return window. HTC should put out a fix, but at this point don't know when, only that they are supposed to be working on it.
Called HTC again. It was suggested that if those experiencing the problem would either call HTC (866) 449-8358, or log onto their web site, and report the problem, the issue would get expedited sooner (IE, the squeeky wheel...).