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I have one. I improved it - a LOT.
First, most of the red flecking is actually dust. Clean it well. Mine shows next to none now.
Mine is threaded well, so no issues there.
Mine focuses reasonably well, but I don't expect it to perform as a normal eyepiece. So long as the central image is OK, I am happy enough with it.
My main issue is the parallax. Even a MINOR shift in eye movement or head movement and the crosshairs start their dance. You really have to concentrate at keeping it centred.
I have an Orion illuminated reticle finder. It performs well, but again the crosshair parallax when the illuminator is on is very annoying.
I paid $79 for my Orion illuminated ret. eyepiece from Sirius in Brisbane. Same one as Bintel.
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