I've used bookit.com twice. Once for a hotel in Waikiki and once for an AI in Cozumel (The Park Royal). The first time I had a problem with their website, called them, and it was fixed immediately. Both times, everything worked out exactly right. I will use them again. I'm very happy with their prices, service, and accurate descriptions.
I just wish they'd send me more email specials. I tend to forget about them.