Using my 550D i have found any pans to be poor compared to what i have always got previously even compared to my HV30 in Progressive 25P,even using my heaviest tripod and panning as smooth as i can the picture has what to me is an unaceptable juddery look,perhaps these 550s need some setting that i am unaware of for smooth panning ie locked aperture or does the jelly/aliasing on these cams cause this.