The problem we've had with the v9s is that from time to time, we'll get customers that have figured it out and can then order stock 984 tokens on ebay and other sites for much less than .25 each. And of course the tokens are worthless to me as an operator. We only use the .950 and accept quarters. I've considered the coupon route but the coupons themselves are not cheap either and there's no way to be sure that they even get used so I'm out the cost of buying the coupon with no marketing benefit. Given these issues, we've not incorporated any 'free play' promotions yet (other than obviously handing out .50 or a buck to customers already in the arcade).