Finally spent some quality time with theses. The short version is I very much like them (I used a pair in my Denk II and Mark V). Indeed a flat field, low distortion, low scatter view right up close to the edge. Very comfortable combination of eye relief and FOV, much better than my plossls and orthos. Plays real well with the Denk Powerswitch, no/minimal blackouts. Neutral in color tone, just like the 15 & 18mm jobbies.
Enjoyed some great views via the TEC200ED of the moon, saturn, Vega, Deneb, Alberio...ranging from 180 to 400X (seeing actually allowed 400x overhead tonight). No hint of EOFB either.
And best of all NO STUPID UNDERCUTS!!!!!
I like them...a lot... and a nice high power compliment to my other eyepieces.