It was that good. The characters are complex and well written, troubled without being angsty/emo twits. The sex scenes are smoking hot, not cheesy at all. This is everything that 50 Shades of Grey should have been (and failed at miserably). Maise and Evan read like real people, albeit messed up ones. The supporting characters also fulfill their roles without denigrating into caricatures or lame stereotypes.
I'm really glad I bought this one, since I'll definitely be re-reading it.