For those with muffled call quality...
Where was your Tour made? There has to be a reason why some phones are muffled while others aren't. You should be able to find where it was made on the inside of the phone - just open up the battery cover and remove the battery and it'll be listed on one of the stickers, like "Canada 1" or "Mexico 5" or whatever.
I have a Canada 1 phone, and I experience:
- Loose battery door
- Sticky trackball
- Average battery life (not like some who say they get 3 days out of theirs... but this might not have anything to do with the phone)
My call quality is excellent, however.