I've ordered from him before. He's not as prompt as other seedbanks, but the orders always come through. He has low prices. That is his only advantage, and everything else about him is frankly unsavory.
Low prices aside, his behavior on IG is really sketchy. He has 5 accounts, HE COMMUNICATES IN ALL CAPS, has disabled all comments, and google nixed his most recent email for unauthorized behavior (whatever that means), probably because he emails invoices directly. And he has a history of issues, even if they've never affected me. Not really sure. Personally, it seems like he comes off as a pollen chucker with an inflated sense of self-worth that genuinely doesn't care about his customer base or the community. "The Real Flavor Creator" sounds so pompous. No idea why stand up guys like Nspecta, Bodhi trust him despite all that noise but that's not for me to decide. I at least trust those two, and they choose to place their trust in GLO, but the jury is still out with me.
Anyway back on topic --- selling seeds you haven't acquired yet is sketchy and I wouldn't put it past GLO to do that.