I bet you haven't seen these before ;)
We use these to work down our ploughed ground, we do 2 passes with them both horizintally and vertically across the field which usually gives us a decent seedbed. Sometimes we might do a 3rd pass at say a 45 deg angle if the field is rough or the seedbed isn't fine enough. Set's of blades much like mower blades except a little larger do all the slicing and breaking up of the ploughed ground. There not really a deep cultivation tool, about 8-9 inchs maybe. Forward speed is a 8-9k on the first pass as it's rather bumpy, then going to 14-15k on the second pass, the faster you go the better job it makes I believe ;)
What a rant that was, heres the pics :D :D