That's how they get you: first book free and you're hooked. Though I won't complain.., happy to support this type of sales model. The series I am currently reading came with the first book free, and I practically inhaled that book and started book 2 right after, with three already borrowed and fourth preordered...
Mad for love is at the very end of my TBR, but I may push it up a bit after hearing how great it is. Oh boy.