I picked this up after recently reading sweet pea and loving it.  It is a very similar concept, I think what makes this an enjoyable and uncomfortable read is the internal dialogue.  Grace the main character is absolutely awful, selfish, hypocritical, and totally unaware.  But I would be shocked by anyone who hasn't thought some of the same thoughts as Grace in all their horrid and judgemental glory.  I was convinced that she was a female psychopath, whereas Sweet Pea felt like it was written as a male psychopath who happened to be female.  I was convinced 100% by Grace, some of the plot and character interactions were funny, witty and sad all at once.  While very enjoyable this was not a 5 star for me for two reasons, the pacing of the book could have benefited from more editing and the plot depended too much on coincidence and good luck.  But well worth a read.