I too just got some from Worldwide and they were fantastic as a seed bank.
HOWEVER, the seeds I ordered were feminized Mama Mia from Seedsman. They came in the sealed Seedsman seed pack, but they were really, really small seeds. I actually had to get a magnifying glass to make sure they were actually weed seeds.
Well, I got 10 seeds, and had to try to germinate 6 of them to get two plants. They all "germinated", but they would only crack open, the tap root would not come out, except for two that did.
I planted those and they did come out of the dirt (well, Jiffy pellets), but the stems were incredibly thin, but they lived. I know you're not supposed to give them nutrients at first, but they were so spindly I gave them a real week solution, which did the trick, and now they're fine, they each only have one set of leaves plus the original "initial" rounded leaves, but they're doing great, with nice hairy stems that now are thicker and look normal.
This is my first grow, so if I don't screw anything up, I should be OK.