I'll start off with I personally have no run global myself. So this will be parroted info.
From what I've seen, some of the reviews are not great. Especially when it comes to their anavar. Many many accounts of it causing painful headaches but not much else. From there I have also seen an independent HPLC testing done by a "customer" (cannot 100% confirm it was simply a good Samaritan) and the testing on oxandrolone came back as no anabolic compounds detected.
Their injectables seem okay, people have seemed happy with the results. However I've personally run anavar from a more well known lab and at no point experienced migraine like headaches, some of the same people who reported those headaches on global also tried the lab I used and also experienced none of the previous side effects they had with global.
That for me, is enough to avoid. I love seeing both Lab and customer posted testing with mirrored results.
But again I have no personally used it, I am merely reporting other people's experiences.