Lewis, I think I would like the easy to use side entry port for bullets in a Vickerman/Wells/Herters (all of a simular construction) but not enough to trade a Forster/Redding competition die for it.
The basic Vickerman design shares the short supporting sleeve with previous dies by several other makers, Lyman, Wells, Herters and now Hornady and RCBS ("Competition" dies) for instance. All of them only support the case neck/mouth and bullet so most, if not all, of them can be used to seat almost any cartridge of the same bullet diameter, including the Vickermans, because they don't fit or support the case body at all.
On the other hand, Redding/Forster dies have a dedicated, fully chambered sleeve that holds and aligns the entire case before seating starts. They work very much like the hand dies used in serious BR competition. They only work for the intended cartridge and that makes them a whole different thing in my mind!