+1 on what Thomas said.
For weddings and portraits the pistol grip can be a wonderful addition. All depends on how you shoot. If you shoot using a tripod the 322 is the way to go in that situation as it is fast to adjust. Some folks use a rotating bracket, as opposed to an L bracket, to allow for intermediate stops between horizontal and portrait orientation. Speaking of which, I guess I know what I am going to do with that
B&H gift card, rotating bracket.
Anyway, I like mine and it's been good with the Mark III and 70-200/2.8IS but I will concede that it is not a BH-55 although my BH-55 was not as easy to use in a fast paced environment. Different tools for different situations.