The ES 6.7 is superb. Flat, contrasty and sharp all the way to the edge at F/5. Eye relief is a bit on the shortish side, 12mm I believe but its surprisingly comfortable to use. The 82 degrees field of view is easily usable at a glance.
You need this eyepiece in your life. This is not debatable. Alternatively you could buy something 2.5 times more for pretty much the same result.
I did consider buying a 7mm Pentax XW. But why the f*** would I?
Ive got a picture of it... hint its upfront.
