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John, the Nagler eyepiece has gained reputation as the pinnacle of premium EPs and there is enough momentum behind it to sustain the monopoly that Televue enjoys on the premo EP market.
The 82 degree FOV of the Nagler vs 70 degree of the Pentax also has a lot to do with the continuing dominance of the Nagler, I believe. Newbies who have rarely or never looked through wide field EPs will be more impressed with Nagler specs and will be inclined to go for the EP with the largest FOV, without considering that in practice 70 or 82 degrees makes little difference (at least for me anyway).
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