Ooh! Ooh! I know these books!
I read Kyrian's book first, back in the summer, and have read up to Danger's book, or possibly the one after that. (I can't remember the titles, only the characters whose book it was. Who comes after Danger?)
Haven't read Julian's book yet, despite it being first, and to be honest I don't plan to - I read the books too quickly, and I don't think I'm missing much in the continuous plot from not reading that one.
Kyrian's book is still my favourite, and it's the ONLY ONE that I don't own of the ones I've read. You don't know how annoying that is.
But, yeah, I like these books. A lot.