I will admit to buying the book. (In my defense, I was stuck in an airport dealing with flight delays and had nothing else to do.)
I was pleasantly surprised. I find a lot of BDSM lit to be really trite or forced. I had thought this would probably be very forced and also way too tame for my taste, given how mainstream the book has become. But... This was honestly one of the better depictions of D/s that I've found.
The characters are developed enough that you care about them until the end of the book (atypical of lots of kink lit). Some (not all, but about half) of the sex scenes are pretty hot, and I think I'll probably read this book again in a few months.