Yep, I tried a 13mm Ethos on a 16-inch f/6 custom newtonian, an 11-inch Schmidt-Cassegrain (f/10 and f/6.3), and on a couple 10-inch f/5 Sky-Watcher newtonians. It is very sharp to the very edge, there's only a trace of non-roundness close to the field stop, and you need to look with attention to notice it. I don't remember seeing lateral false color in fields of averagely bright stars, it seems to be quite well corrected for all aberrations.
Very large fields are a must for non-tracking scopes but 100° oculars are too heavy/long/expensive for my me and my gear. Next month I'll order a 4.7mm 82° Explore Scientific. For these magnifications a large field is not a luxury at all, and the 119€ price is not in the luxury range either. After I receive the so-called tax "refund", I'll place my order immediately.
It will give 102x with my 80mm (204x with barlow), 320x with the 300mm dob, and 265x with the 127mm Celestron 5. All the practical highest powers will be covered on all my instruments with only one eyepiece, got to have a buying strategy.
TS 8x40 Wildlife, 10x50 Marine/Fujinon 16x70/TS 80mm triplet, 6x30 finder, EQ-3 mount, TS 2" 99% diagonal/Celestron C5+ and 6x30 finder, DIY tripod/5" Bahtinov/12" GSO dob, 8x50 finder/Meade 2" 24mm 82°/Hyperion 24,13,10mm 68°/TS Expanse 17mm 70°/SW 7mm Panorama 82°/Ultima 2x barlow/Astronomik UHC-E filter/Baader O-III/Astro Solar 5" & 80mm filters/Sky Atlas 2000/Rükl's Moon Atlas/Canon 400D/5mW green laser