CSR (Chase Sapphire Reserve): Accepted $150 offer.

Useful data points:
Rep stated any cancellation has to be within 41 days of the date the fee posts to get a full fee refund, and is not prorated if canceled after that. I believe this is a change from the past and may be part of why I received a $150 offer this year instead of the $250 I received the last two years (or perhaps just due to the changes in annual fee date, me calling in a year later meant I was no longer in the period where I could cancel and get a full refund, so they made the offer smaller).