This does appear to work within limits. If I were to guess, there is some sort of random number generation associated with doing an update check on the day you are scheduled to receive the update. On Tuesday, I tried repeatedly with no results. On Wednesday AM, I tripped the update to download on the 2nd try. So if your day for upgrade has some, resetting the services cache may speed up your update time on that day. Just guessing, though...I got mine today.
Maybe someone can help with this one. I tried the update through this method and it seemed to start working but never rebooted and istalled. Now whhen i try it again it starts to recognize an update is available but then goes to "your device is up to date." Anyone have any ideas?