I posted the following links a couple of years ago and which should answer a few questions regarding Baader Hyperion, Orion Stratus and Vixen LVW eyepieces :
http://www.svenwienstein.de/HTML/stratus_english.html
http://www.svenwienstein.de/HTML/hyperion_-_english_version.html
I have a set of Hyperions and found them to be good all round performers depending on the particular telescope you are using. On my long focal length refractors (f15) they are magic, sharp right to the edge of the field yet in faster telescopes say less than f8 they are not quite as sharp at the edge of the fields. The ability to couple the eyepiece directly to my camera using the M43/T-2 adaptor has been a boon for eyepiece projection. One thing I dislike is the fact that if you remove the bottom negative lens to fit a fine tuning ring or just double the focal length, fine paint particles head straight for the field lens which is very difficult to remove owing to its static nature. Unfortunately, the image plane is formed at the field lens and any dust, dirt or specks shows up clearly and this is a real nuisance when observing the planets or the moon. It's not obvious when viewing star fields of course.