Can you comment on the quality of the bluetooth? Initially many people thought the BT was fine on the PPC6800 because callers sounded fine to them on their snazzy new phone. Eventually they got enough complaints that people realized they sounded horrible to the people they were calling from their 6800. Turns out even though if you own a 6800 and call on your BT headset your callers sound fine but randomly you will sound like crap to the people you are speaking with.
This hasn't been reported with the WM5 version of the 6800 on Telus just those who got the WM6 version on Sprint. I'm not sure if it is the BT stack from MS that is the culprit or where the issue lies. And since it doesn't happen on every call, it is hard to diagnose. It seems to be more common with longer calls. The phone speaker is OK - it happens with Bluetooth only. I've personally tried 3 different types of BT headsets - about 10 others have been listed with this same issue.
We have it on the HTC WIKI though - http://www.htcwiki.com/page/HTC+Mogul
So if you've spent more than a few hours using the BT headset with this phone and have checked with your callers we'll see if this is common with WM6 or if it is a unique thing to our HTC mogul phones.