Got my second bump in a week, and this one worked out much better than last week's...
This Sunday, I was booked PDX-JFK-BOS (booked economy, upgraded to C+ for the long leg and F for the short leg). PDX-JFK was oversold by 2. They needed both seats, and the other volunteer was also going to BOS. We both got $500 and rerouted PDX-SEA-BOS in confirmed first class for both legs. Got to Boston 25 minutes later than the original flight. Definitely worth it!