I was just prompted to apply the update on a perfectly fine unit. The patch downloaded and installed, then rebooted into a 3-light ring.
Just called support. "We understand that the you feel that the patch has caused this issue, but since your warranty expired 3 weeks ago you'll have to pay to get it repaired".
Then the service rep tried to insult my intelligence by offering a "$20 discount on the repair". The same $20 discount I could get if I hung up and did the repair through xbox.com myself.
Pretty crappy service, Microsoft.