Just sharing (because I care)
I recently acquired this second hand (thanks Eric).
It shows notably less astigmatism in my f5 dob than the 25mm GSO plossl (which was not at all bad) both at the edge of view and at the same apparent field of view, and outstanding sharpness and light transmission
. It's really for the 4.5" f8 newt though to give the maximum TFOV I can get.
I am a happy camper. Next stop a Nagler or similar when the readies build up!
regards