So far this year I've had two AS flights that were oversold, and one flight that was thought to be oversold right up until boarding was completed.
I took a VDB on one of the flights (ANC-SEA). I was given a $400 MyWallet credit voucher and was rebooked on another flight that departed an hour later. It was the easiest $400 that I've ever "earned."
For what it's worth, there were three other passengers who accepted VDB on that same flight - but they had to be accommodated on later flights into Seattle.