I love the Bogen 3421 except for the fact that it doesn't use the arca-swiss style plates so no interchanging plates and no L plate. If you only plan on using that lens then it should be fine. If you plan on using other lenses without a tripod collar, then there is no way to shoot in portrait mode.
I'm thinking about switching to an Optech gimbal head that can accept arca-swiss plates. From what I've read on the Optech, it is good after cleaning it when you first get it. It goes for around $150 so about the same as the Manfotto 393/Bogen3421.