I use the Wilson trimmer, without any Sinclair accessories, and it is extremely consistent. It is easy to set up, but would be a bit easier with a micrometer head, so I could just record the setting and return to it later.
It is also quicker and easier to use than the trimmers that use a collet and pilot, since you have to put the case in the collet, advance the pilot into the neck, then tighten the collet in order to get them to be consistent.
With the Wilson, you just slip the case into the holder, bump the case head lightly on the bench to tighten it in the tapered holder, then slip the holder/case into the lathe up against the stop.
Since the case holder only engages the case body, and there is no pilot for the neck, one holder works for all the different variants of the same parent cartridge (so long as the body taper and length are the same). For example, 25-06, 270win, 280rem, 30-06, 338-06 and 35 whelen all use the same holder.
I hold the trimmer in a small vise on my reloading bench (handy for a lot of other things too), so I don't need a stand. I never have figured out why people would use a clamp to hold the case/holder on these trimmers; I just hold in place it by hand. The trimmer body needs to be held above or over the end of the bench (vise, wooden block, etc.) so that the handle swing will avoid contact with the bench.
For all its accuracy and consistency, the Wilson is also one of the least expensive lathe type trimmers available. It is an elegantly designed, simple system that really works.