Warning 2.1 Hero upgrade is flawed process. Be sure 2 Factory Reset
When you upgrade your Hero to 2.1, as soon as 2.1 is installed, before entering userids or anything, do this: Home/Menu/Settings/Privacy/Factory data reset. Unfortunately, I didn't. Bluetooth media audio didn't work, plus I had various performance issues. Called HTC tonight. They have discovered that the 2.1 install wasn't always resetting the phone and old data from the previous android was hanging around. Well it worked for me. Unfortunately I had to reinstall my ids, apps, settings, etc.