I’ve used the Groupon app a few times for the Now Deals. It is very convenient as long as I have a credit card linked to the account. I can just click “buy now” to get a Now Deal (usually I get restaurant ones) but if I don’t end up going to the restaurant Groupon refunded the money to my credit card on the same day. If you have a smart phone I suggest hitting the Buy Now button when you actually arrive at the restaurant that way you know you will be using it within the time period. I’ve also had a few questions about the deals and Groupon replies very quickly.