I got this to use with a Startravel 102mm refractor, which was bought for viewing wide-angle subjects such as nebulae and clusters. It does this job very well. The real field is greater than with any 1.25" 25mm eyepiece, but the larger magnification gives a bit more resolution and a darker sky background; the smaller exit pupil helps ensure that no light is obstructed by the pupil of the eye. I can find little to criticise; sharpness is well-maintained across the field and I haven't seen any tendency to flare or unwanted reflections, despite the wide angle and complex construction. The only fault worth mentioning is that there is some pincushion distortion, but given the angle of view, this isn't very surprising, and I don't think it's a serious problem for visual use, given the good image quality. I also like the screw-up eyecup, which allows for precise setting.

SL 2" 20mm 80° EP.
This is an extremely competent eyepiece, with great eye relief and sharp images right to the edge of field. I can't detect any off-axis aberrations, edge of field brightening or coma. A target is easily followed across the whole FOV and you don't have to peer 'into the corners' to see the edges. It's hard to find any negatives at all.