My shopping list: Around five books ordered over a period of three weeks, all fiction (all SF, including a graphic novel).
My experience: Four of the five books were delivered within a week of placing the order. For the fifth book, I received an email from Fabmall informing me that the books was out of stock and they were trying to identify alternate sources. A week later, I received another email informing me that they have been unable to source the book and that my payment would be refunded. I got my refund in three days.
On the whole, I am very satisfied with their service. While they have a pretty extensive range of titles on offer, I wish a lot more would be on the shorter delivery schedule (3-5 days, as opposed to 30 days). Also, like amazon, discounted prices and other offers would be very welcome! Highly recommended.