Carib is a great book, JR does a great job keeping things fresh and challenging others to raise their standards.
The latest was a couple of 5 and 6% rebate months for all horse bettors. They have offered 3% for a while, and the seemingly minor increase is dramatic to those familiar with racing.
Good luck with them, I've found their sports opinion pretty tough to beat, when they aren't offering a middle of the road number.