It was a great online shopping experience. Not a lot to say about the item that works fine. I haven't had any problems with the qsfp28 modules. Have done throughput test on these modules and nearly the same as they are advertised.

Had been looking for 50G BiDi modules for a while. Someone suggested me buying products from fs.com, high-quality as he said. So far no issues. The quality is very impressive, better than my previous used brand name products.