I read this recently and felt a little disappointed by it, as I had heard favourable things.
It started with a lot of promise, but like Ruth says, but then you realise how so self-centred and unlikable the main characters were. they both didn't work as a partnership either for me, I just couldn't see how they got together. Although I didn't give up, by the end I was glad to get rid of both of them.
Clever idea, but I wish I actually cared about it.