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This is the same 80deg Andrews sells under its badging, and the myastroshop price is cheaper too! I believe it is a GSO EP.
I've tried one of these in my 17.5" f/4.5 scope. It does perform better than the 68deg GSO Superview 30mm, but it still does show astigmatism around the outer third of the FOV, which is something a coma corrector won't heal. It is better for slower scopes.
Just my hobby horse, but for me, 80deg is too wide. You need to move your head to be able to see the entire FOV. Our eyes have a range of 68degrees- no coincidence. It is like too big an exit pupil- your eye just can't take it all in. It does make for an interesting experience, but for me, not an everyday practical one if you are having to push-pull your scope. If your scope tracks, I'd suspect you'd still be having issues with finding its sweet spot without it getting tiresome.
We get too carried away with "superwide FOV" as far as I'm concerned. Amazing things are achieveable with glass today, but we forget that there are limitations with being human. See what I mean?
I'd say consider your choice carefully, and give yourself a cooling-off period. The person whose 80deg EP I borrowed doesn't use it as their prefered widefield EP for everyday use.
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