I'm biased. I'm a fan of Cassandra Clare's novels...
I think I even prefer this series than The Mortal Instruments one. Or Maybe it's because of Will. Hell if I'm not team Will. I really love Jem, though. ;)
And I think I love Will even more after reading Clockwork Prince.
The misteries, drama, conflicts and characters are so enticing that it's really hard to wait for the sequel. And yet, I'm dreading the end of the series not only because we will have to say goodbye to these amazing characters but also because I'm afraid of what the end will be.