I'm using them regularly. I have all CZJ 0.965" orthos, except 8mm one. Then some vintage Zeiss orthos (7, 9, 15, 20mm), and more recent ATC eyepieces, 20mm Kellner or 8mm Erfle (these are the only 8mm 0.965" eyepieces I know about which are still available today).
CZJ O-25, vintage Zeiss 15mm, CZJ O-12.5, ATC8E, and CZJ O-4 are in my workhorse box:
Here are some sketches made through them.
Zeiss O-15 is very nice planetary eyepiece, in my 82/1670mm refractor
In better seeing, it is replaced by CZJ O-12.5
After this year new purchase, FOA-60Q, O-4 sees more light. It worked well on Mars in the configuration without the extension
Edited by Sasa, 03 November 2018 - 03:32 PM.