The coatings are really different between the Stratus and the Hyperion eyepieces. Here's a pic to show it. Left is the Hyperion, mid is the Stratus and right is the Vixen LVW.
http://www.svenwienstein.de/Pics/13mm-Reflex.jpg
The Hyperion is clearly much darker then the Stratus.
Anyway, I've got both the 13 and 8mm. Never regretted buying them. Towards the edges the 13mm gets softer but not very much. This EP is most used in my Celestron 12" F/5.
Anyway, have fun with them.