Anyone have experience using ADAT to extend their Focusrite Scarlett 18i20 (or similar devices)?

I can buy a used Focusrite Saffire PRO 40 for about 60Euro and wanted to use it to extend my Scarlett 18i20 to get a total of 16 Mic inputs, but I don’t have any experience with ADAT and would prefer not to buy something that’ll turn out to be a 60Euro brick.