Absolutely love this eyepiece. Great wide field views with dark background. Sharp to the edges. This is the most frequently used eyepiece in my lineup.
I bought one of these to use on my 18" Obsession Classic and have been very impressed. It's nice and sharp and easy use (no blackout problems for me). I haven't put it up against a TV 31, but for the price this is hard to beat. Watch out for the lens cap on the bottom- my views started getting very "gauzy", which I at first attributed to poor optics. When I looked at the bottom lens it had what looked like a big greasy smudge. I cleaned it and it mysteriously reappeared after I replaced the bottom cap. Turns out it was FROM the bottom cap! I cleaned the eyepiece again, threw out that cap, replaced it with a spare TV cap, and the problem was solved.
Outstanding performer with great contrast and pin-point stars to the edge of field even with fast f/5-f/6 optics. Easily the best bang for the buck in premium eyepieces of this focal length.