I don't know what I could add except how much the characters enter my thoughts during quiet moments. They live and breathe in my memories and I find myself smiling in remembering something they said or did. I originally read the free books offered online, but simply had to own them, hold them in my hands as I reread them ... so I bought the series to add to my bookshelf.
I highly recommend it if you enjoy action, slash, humor, and characters who will haunt your days, nights; you will welcome them when they do.