lol
All they do with crossfit pull-ups is use momentum. I don't care if you can do 30 crossfit "pull-ups." If you can't do 10 slow, all the way up and all the way back down until your arms are straight pull-ups, then you can't do 10 pull-ups.
We do "strict" pull-ups most of the time which is all the way up and then down. Nothing will make a grown man feel like a bitch like doing pull-ups.