I bought from Humbolt Seeds this year. I doubt I will be making another purchase in the near future. I'm not certain all of their genetics are stable. I'm growing 2 strains, 2 plants each. One plant from each strain has at least one mutations and one of those has 3 mutations.

YMMV

I’ve germinated 4 out of 6 Blackberry Moonrocks from Blimburn, purchased Aug 24. 1 died at 3 days. 1 germinated and had 1 cotyledon, 1 had 2, and 1 had 3. None of the plants got larger than a deck of cards.
At the same time I also germinated and grew a Fat Bastard auto from them. And that plant is a happy girl.
Would I purchase from them again? I don’t think so.