PRG was my primary until I got the Citi Prestige last August. My spending on PRG dropped to almost zero, although I did put in a few random purchases at restaurants in the last 2 months knowing my renewal was coming up.
Offered $50 immediate and $50 after spending $500 in 3 months. Took it.
That essentially makes my fee $75 which in turn is matched by the airline thing, although one of the reasons Im unhappy with the card it they took away the United Mileage App thing where I could use the $100 at Amazon.
Hopefully they make some improvements or next year I cancel for real.