I picked up the Meade 26mm MWA last week. I don't have any other 100deg AFOV eyepieces to directly compare with, the closest being a 20mm Meade UWA 82deg.
I tested in a Zhumell Z8 8" (1200mm, f5.9) both with and without a GSO coma corrector/field flattener and a Explore Scientific 16" truss tube (1820mm, f4.5) with no coma corrector on a very clear night with excellent seeing.
Star drift test timing in the Z8 with no CC showed a TFOV of 2 degrees. In a perfect world which if all the numbers in the calculation are accurate (which they probably are not exact) and not accounting for distortion (which there has to be), is a AFOV of 92 degrees.
In all setups, stars in the center of the field appeared slightly sharper in the 26mm MWA than in the 20mm UWA, and I didn't notice any edge of field brightening.
In the Z8 with no CC installed, the outer 30% or so was a little out of focus, however not so much that it was super bothersome for just providing some extra field around the subject.
In the Z8 with the GSO CC/FF installed, stars out to almost the field stop (5%) were sharp. The AFOV is so wide though it was completely unnoticeable unless I was specifically concentrating on a star right at the edge which would never happen in practice.
The experience in the ES 16" was a completely different story though:
The outer 30-40% of the field quickly became very out of focus and the edges so out of focus I couldn't tell there were stars,. unlike the views in the Z8, it was so distracting that I would consider it unusable. I did not have the coma corrector/field flattener with me for testing though.
Hopefully the CC/FF will clean up the edges in the 16 as happened in the 8, because this EP was purchased specifically to provide the widest TFOV in the 16", however that test will have to wait for another night.