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I use them mostly on short (< f7)FL refractors.
My 3 highest mags are a 5mm Takahashi, a 6.7 ES and a 7.5 Tak.
While the 6.7 is an excellent EP and a bit of a fave for Lunar work, its contrast and sharpness fall slightly, but noticably short of the Taks.
The Taks however have only a 50* FoV and really need, or at least benefit from, a tracking mount.
If I was like 99% of people out there I would recommend the Pentax XWs (70* FoV), but I have problems with their eye position and never got the hang of them. A shame, as when I could get them 'working' the views were nearly flawless - particularly the 7mm.
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