The GNC c-99's are my favorite to grow. I have grown many strains over the last few years, always from seed. Those c-99s seeds are the only strain I have purchased for a 2nd time. It is the easiest, most forgiving strain I have ever grown. They grow fast and aren't picky about ferts or PH. They arent real stinky and they are pretty uniform in growth, the 2nd batch(current) is real uniform, out of 3 seeds I germed all 3 are almost identical looking females, oh yeah they show sex earlier then most. I love the high( can be a little intense on light weights). I have grown 3 versions of NL( Sensi, Oasis, Fem,). Those c-99s have been alot easier to grow, yeild is about the same for both. well thats my two cents, I also have Killer Apollo 2 weeks behind the c-99s. I cant wait to try. Good smoking all