I have quite a few of the QR compounds. What I have tested has been very promising, but I cannot vouch for all. I've performed melting point on about 10-15 of them and labmax on anything I've made. My TestC bloodwork benchmarked almost exact to my TRT watson brand cyp. I do taste\appearance testing as part of my process and nothing yet has been a red flag for me.
There have been others that said "MFL used QR raws" and MFL is associated with some highly bunk crap. However, I've yet to see any actual test results and given MFL would have benefited from scare tactics by discrediting one of the larger "homebrew" sources, I would not take this as gospel. IMO, test what you buy and ignore rumors.
QR provided great service as of 3-4 months ago, but I can't speak to it recently. They use "discrete" creative shipping, but I doubt that customs is really that dumb. Your paying about double the cost of going direct to China...if you like the discrete option or you believe their product is possibly higher quality than what you would get going through a china rep, then QR is a good option IMO.
I will say that I have since went direct to China reps since (3-4 mos ago). Not because QR did anything wrong, but just for cost savings.
My 2 cents..