I got Afghan and AK48 for my first seed order, germed 3 of each all of them cracked and are growing pretty good, I would say the AK48 is a short grower with good branching from what I've seen so far. I'm four weeks in and the Afghan and AK48 are both around 7 inches tall with one afghan only being about 5 inches tall. I'll be flowering in two more weeks and thats when the fun begins I can't wait, you can check out my journal if you like, the link is in my sig, I'll be updating it later today with new pics.
For the guy that got 30 seeds that wouldn't germ, either you got really unlucky or just can't germ seeds for shit, thats fuckin horrible, did you ask Nirvana about replacements? One guy on here got 10 seeds that wouldn't germ and they said that they had a problem with the grower that produced those and that they wouldn't be using him anymore and sent him a new pack of seeds from a different source.