I had a 6mm Delos for a while. The eyerelief was certainly excellent, the views were crisp and 72deg field was nice, but I found it kidney beaned a lot and was a little tricky to use. That was in my 12" f5 GSO dob.
I am sure with a bit of practice it may have been OK and easily beat any other EP in that range that I tried, found I had sharper stars than with the 7mm Nag T6 that I had.
I am unable to comment on the other EPs as I have not really had the pleasure!!
Malcolm
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