Simply put, beautiful. This was one book that needed to be collected in Hardcovers, and it does wonders for it. Maleev's art, at that size, just is... beautiful. It's just amazing to look at. Reading through the entire series again is just so much fun, and it just shows the greatness of Bendis and Maleev.
If you haven't go pick them up. I'm about to get the 3rd Volume HC (I have 2 and 4), and it's well worth it.