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.