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Well Mike,
I have one (6.7 UWA), along with the 8.8UWA and the SWAs in the longer focal lengths (13.8, 18, 24.5). So I can give you a reasonable comparison. For my money they are all great. I do find the 6.7 needs a really good night to be useful as it gives me approx x300 mag on a 8" SCT F10. But when the seeing is good, it is good.
And while I don't plan to change it I did have some thoughts after getting it.
Basically they went along this line, is a UWA at such a low focal length the right choice? While I am very happy with the eyepeice I believe that the design to get any UWA must produce slightly less sharp images than a comparable Plossl (or similar quality EP) as there must be compromises made to get the extra angle. Since this is a low focal length, you are talking about high magnification (probably planets, splitting doubles etc) and in this case do you really want / need the wider angle or would the sharper image be better? While it is great and I cant fault the EP, it doesnt produce the "out in space" feel of the longer focal length eps as you simply dont have a huge FOV anyway.
Well hope this make sense. I do plan to come to one of your nights out so you / others are welcome to give it a go.
Anyway if you can find one for the right price (as I did) you wont regret it, otherwise I suggest just getting a good quality low focal length ep from a reputable make and enjoy that in stead.
Oh, and I don't experience any problems with the eye relief, it is short and not for someone with glasses, but it is better than my celestron 7mm plossl.
Any questions just PM me.
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