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I echo what Mental said about the Hyperions performing poorly in fast scopes. I bought a 5mm for my 10" dob and it showed bad vignetting. It was quite distracting and rendered the field of view far smaller than the 65 deg. (or is 68, I forget). So back it went.
Being a 5mm, I was happy to try them as I didn't want to spend lots of dollars for a focal length that would get little use. So now it's back to spending the big dollars to add another Pentax XW5mm to my collection. Adorama in the U.S. have got them on special for only $279 (+ about $50 shipping) at the moment- that's the cheapest I've seen them todate. Opt are still selling them at $360 plus shipping!
The Vixen LVW and Pentax XW's are fantastic eyepieces- 20mm eye relief, large field of view and very very comfortable! They perform beautifully in fast scopes both in edge performance, sharpness and contrast. There's nothing not to like and worth every single penny!
I've avoided the Explore Scientifics purely because of the lack of eye relief which is important to me, otherwise I hear great things about them.
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