Im going to buy on ebay.
The problem with Zhongyi is that they don't have Canon FD adapter, only EF, Nikon and M42 - so none of them will fit my lenses.
For FD on ebay there are only this "RJ", Metabones and no-names (you are right, most probably the same as "RJ")...
And Metabones is TOO expensive
Anyway, will post some tests afterwards. Thank you for help