I had a chance to play the coupon at Terribles.
I decided to play $50 on VP. I played for what seemed like forever, but never got up more than about $20. Finally, the machine took all of it.
I went back the next morning to claim my bonus play and (of course) lost it all in short order.
A word of caution. I went back to claim my bonus at 5AM so that I could get to CES. I found out that the slot club desk doesn't open until 8AM. I was able to go back for the bonus, but don't assume that things go 24x7 there.