Anyone ever grown fast version seeds?

Very curious if anyone has grown these Fast version seeds? I've just seen them online whilst doing my seed shopping, can't find much on youtube about them just timelapses.

C99xblueberry fast from Seedsman. End of Sept just under 2 pounds. Big and fast.

C99 Fast from Canuks, should be done by end of sept with a very nice yield. Very easy to grow and grows fast, hands down the best smelling plant i've ever came across, so good you just want to chew on a bud like it's an orange.

Think I may add some fast seeds to my order then and give them a go