I have no idea why I hesitated so long in reading this - probably because the blurb made it sound a bit too much romance-focused. In any case, I enjoyed it a great deal; it's one of those books that I just wanted to keep reading, thinking "just one more chapter, then I'll get up and go and do something useful instead".
There is romance, of course - is there any YA dystopia that could do without it? - but it wasn't the focus of the book. I loved the developing friendships, and found the characterisations good, and the plot different enough from all the other post-apocalyptic "group of survivors must do what they can to survive and find a better place" to never really feel too predictable (just somewhat at times, but that's a bit inevitable, I suppose).
I'll be looking forward to the sequel.