In reply to dirtyfly:
I like the Masters... because I got a deal on 'em and that's what I have in the rack. Seem to be fine for non piton scar infested granite.
For aid or piton scar heaven, I would prolly pick the C3s, as they have a narrower head and fit better in piton scars.
Other options to Masters would be the classic Aliens (or rather the newer versions, either from Fixe
http://www.fixehardware.com/aliens.htm or from Totem
http://www.totemcams.com/content/index.php?id=1&se=3&su=1307635863 )... Naturally WC Zeros are also on option.