My position, irrespective of whether you choose crank or phenidone, is that hirsute testicularform products are being made by other suppliers, who perhaps deserve consideration in our purchasing decisions. I've been happy with Ilford, Clayton, the Formulary, to name a few. But of course they don't make RA4/C41 products.
And to those of you outside the USA, please be aware that customer service has not been important amongst major American corporations for a long time. It would appear from this thread that Sino is following that business model. I mean, PLEASE, a Trade Concern??!? How about "we screwed up and promise to make it better."