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Nick,
there are other options, that I haven't seriously investigated, but which are cheaper and don't magnify. My brief impression was that if you have only one eyepiece to correct for, seriously consider one of the other coma correctors. If you want to use a number of eyepieces with corrector, get the Paracorr as it is the only one that allows convenient adjustment of the distance between the eyepiece and the correcting lens assembly. Also the Paracorr corrects the field curvature issue in the XW14&20 which is a big deal if you want to use those eyepieces - I don't know if the others do that.
I don't mind the 15% magnification increase as I was considering swapping my 22mm Nagler for a 17mm - now I have an 18.7mm Nagler when used with the Paracorr. The 22mm also has 2mm more eye relief than the 17mm, so I'm happy how things have worked out.
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