Oh Crossfire series is my FAVOURITE!! 50 shades eat your heart out. Keep in mind though, while I am a book worm, and generally well read (part of why I had difficulty with 50 shades, the writing) I'm not big on erotica...it's new to me mostly. I did enjoy 50 shades despite the writing, but I found the crossfire series to be not only much better in the writing department, but I enjoy the story line much more, too.
I am so not so patiently waiting for the 3rd book, which they keep delaying.