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If you are interested in visual, I'd say forget it. I had a report the other day from an owner of a 20" F4 who reports that after purchasing the suitable spacer adapters for his Ethos 13mm and Nagler 20mm, that the on axis sharpness with the MPCC was clearly much worse than the Paracor which he rated excellent. He promptly threw the adapters back in the box.
In general you need to use the appropriate spacing rings to attach to any eyepiece, though there are a handful of Televues like Radian, Panoptic in 1.25" that you can make a generic 2" adapter and fit the 1.25" EP straight in.
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