I have a Newton bracket on both cameras. I love them and have never had them be wobbly unless the screws are working loose which is rare. I use them with the 580EXII.
Printable View
Extra Hands, decent sized soft box/modifer/bounce - all tools of the trade.
I find it interesting that some individuals seem more prone - could it be the eyes are dilated by something they ingested and/or is there some sort of genetic link to wider than normal/more reflective than normal eyeballs.