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I expect edge performance of the Masuyama to be similar to that of other wide angle 5 element eyepieces (ie. challenged in many types of telescope). Televue and Explore Scientific don't use a bunch of lenses to correct aberrations just for the fun of it.
It might be good in the Celestron Edge scopes with their flat fields and slow f/ratio, as well as slow refractors.
Note to Electric: most fast APO's don't come with built in flatteners, they're usually an add on device for imaging (including the Esprits which are triplets with an accessory flattener). There have been a few designs released more recently which do include flatteners built into the design, in addition to the long standing FSQ and NP.
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