That's a weird book. It describes a crumbling dystopian society that's believable/familiar enough to be quite uncomfortable, and the story of the relationship between two people who are both essentially unlikeable, although in different ways. Lenny is pathetic and obsessive, Eunice is vapid and annoying. The book is an alternance of chapters taken from Lenny's diary and from Eunice's communications. And the title is quite apt - I felt "super sad" when reading it.
And yet - I found myself continuing reading, wanting to know where it stops and how it ends, expecting the worst that seems inevitable and still hoping for a happy end. And all things considered, I really liked it, but I'm unable to say why exactly :)