Anyone using Wilson's rear folding BUIS?

I guess that's a "No"

For the price...get a Troy.

I like them.  good ring size, plus elevation adjustable.

I use it on builds that I want to have HK circle-in-circle sighting on.
I get a front with full hood (e.g. pri, pof etc) and FIRST center the front post in the front hood and then use the rear elevation as the only elevation adjustment.

BUT there are those with firmer lockup than others - be warned.
the ones that lock up firm are great IMO.