Oh, they're great books! I actually read Ironside first, not realizing it was part of a series until I was a little ways into it. I liked it a lot, so I went and read Tithe, which I did not like nearly as much, but I thought it was alright. Though I'm really glad I read Ironside first by mistake, I don't think I would have ever read the other two books if Tithe had been my first introduction to her books.

Valiant is definitely my favorite of the three, though- I love Valerie and Ravus!

Papillon- Have you read Wildwood Dancing by Juliet Marillier? It's not strictly faeries, per se, but it might be to your fancy.