Steer clear of Lifebooker and go with more reputable experience flash sites. Lifebooker has much to learn from Groupon and Gilt. They need to screen the businesses that they work with.
I bought a coupon for a new business in NYC, Wanna Glow. It was a new business so the yelp reviews were fine.
Lifebooker must have been the first site that they offered their coupons through because the bad reviews rolled in. It was impossible to get an appointment with them. Then they would schedule an appointment after the "loot" expired and tell you that you had to pay $200 in addition to your loot. What a joke.