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Hello Paul,
I use an ES 18mm 82d with my c9.25".
Previously I used a WO 25mm 72d - the coma was fairly bad on this one so I got the ES.
I like the ES - there is still some coma in the outer 20% or so from centre - but overall the performance is very good. It gives good resolution of GCs and nebulae are quite good. I don't do a lot of visual observations - mostly imaging. I get used to the outer coma, mainly because it is so much better than the WO which I was also getting used to. If you aren't looking for round pin point stars to the edge then it is quite good.
There is a ES18mm for sale in the forums now - it is worth buying; even if you don't like it you can always sell it again. I think it is a good eyepiece for the price.
Regards,
Tony.
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