Also in the mix I would offer as a good "value" competitor the TMB Planetary eyepiece line...
I have not compared them to the Pentax XF so I can not comment there...
I have compared them to the Pentax XW...the XW is better but, at a much higher price. Better how you might ask...to my eye it was a bit better in all categories (build quality, eye relief, FOV etc.). That is not to say the TMB is bad at all...it is just not a "high end" piece of gear.
The TMB Planetary eyepieces are available here in Australia from Frontier Optics at AUD$139 (from memory).
I find the eye relief to be good and much superior to plossls of similar focal length...but will add that I do not wear glasses.
I would echo the advice shared by someone else earlier in the thread...if you can, try before you buy...
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