The only nudes I have done is when I accidentally got my feet into a frame once. I've been looking at ball heads recently and pretty extensively and have to say that I can't find a negative comment about the Manfrotto 410 head except one that said it could back travel if the load is too much and that can be overcome with tightening the locks. Also the same reviewer said the lock button for the removable camera mount can break off if it is knocked over on it. These are minor and not to be unexpected problems that aren't a problem if the unit is used correctly.
Bottom line is I'm going to order one myself. Jan was the first to mention them to me as he uses one with a Chamonix 8x10 with good success.