I use the ST-E. The top part of rail is identical to the super-color, but the bottom part of a ST-E fits "straight" in to my Arca-Swiss clamp. The front has 162mm square panel with reducer for my normal lenses, while all the big lenses, up to Ilex #5 and balopticon optics, fit the bigger panel. I have added bag bellows, 60-80cm rail, and standard and bag bellows for my 8x10 back, a bit on the heavy side compared to my 8x10 bender, but more on the sturdy side. To avoid the wagging, I either use a monopod or the Manfrotto long lens support. I still need to adjust a used plastic suitcase to the 8x10. For 4x5 I mostly use my Chamonix