Didn't like the twit-up eye cup at first, but makes adjusting eye relief easy. Used for binoviewing. No aberrations , but it's used in F8 reflector and F10 SCT.
Great eyepiece esp given it's price.
Pros: very sharp, twist-up eyecup, easy to handle
Cons: none
This review was written in the old system and had content requirements that are different than reviews written today.