Got one. The 50mm version.
Mine is the straight version.
They are pretty basic but OK. No focusor on them , you simply adjust the eyepiece and clamp and test until you get a good enough focus. The eyepiece comes with an barrel extender that screws in.
Haven't tried it with a star-diagonal, don't think mine will reach focus that way with the existing crosshair eyepiece as there is insufficient back focus.
I'd rather have an 80mm finderscope , better for finding faint fuzzies. I knew someone who got a 80mm version and it was "super" , I would happily toss one of them in handluggage when travelling as grab and go scope if I didn't already have a pair of 20x80 Unitron binoculars which travel with me on holidays (great for checking out the beach from a headland or high sand dunes to spy on who is fishing and spotting where fish are feeding in the surf , and oh , also for stargazing . :
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You are probably looking at 40-50 USD postage to to get one over by USPS airmail.