I agree that circle hooks are fish friendly.

Perhaps a little less fisherman friendly -- I cant tell you how anxiety provoking it it is to watch your rod tip twitch-twich-twitch as the fish begins to munch your bait and not want to yank.

I find it best to wait until the fish looks like it is starting to swim away with your bait and then just start reeling -- the hook really does catch on the side of the lip. Cant think of one deep hooked fish in the past two years.