I just bought this purely for the low profile rings that I am now using with a regular finder scope. Since I don't need the guide scope it is for sale.
It is the same model as this one sold under SVBONY and other names:
https://tinyurl.com/yxz5es6z
I had a look through it with an eyepiece and the optical quality seemed fine. The focuser has a coarse adjustment of up to 2cm and then the helical focuser has another 1cm of travel.
Asking $40 plus post.
Enquiries by PM please.