So my experience was this. I was annoyed at the book in the first place 'cause Kell was gone so that didn't help. Zane... Oh my Shards. This is a long rabbit hole. So, when I met him I was like, "Huh. Okay." But as things went on, he frustrated me 'cause I couldn't figure him out. My solution? Write about it. Every time I got a new chapter from his POV I wrote for like an hour. The only thing I really concluded was that I hate him and his only real purpose was to help Vin lock onto her identity. The ending though... storms. I loved the ending. It was an emotional roller coaster (as I've come to expect from Sanderson) and it got me hyped for the next book which satisfied. So. Hard.