I also ordered from SRY before, but just a 1 kit of Sema5, which tested as around 4.6mg or something like that, I don't remember the exact number already, but they were transparent about the underfill and their price was low, so I bought it and just simply adjusted the dose - result: it worked just fine!
Customer service, communication, ordering and payment - everything was fast and smooth.
I like their transparency about test results and discounted prices on products that test below/underfill. It is a very promising vendor, but still have a lot of room for improvement.