I like the ones that allow the camera to flip, while the flash stays put. Way more efficient for you and can allow you to be ready for the shot faster. From what I have read, this one is a good one. They also sell softbox and umbrella kits for it. Just not sure I want to walk around the wedding reception with a softbox above my head. However, if they work and the pictures are better with it, I may try it. For now, I just plan on using my stofen diffuser.
BTW> Search the forums for flash bracket. There are lots of threads discussing them.