It's very possible to grow good weed with bagseed - after all, just because someone doesn't know the name of the strain in the bag, doesn't mean it doesn't have a strain. It's even better for your first grow or two, so you aren't paying good money on something you'll take out your "growing pains" on. However - after that, you may want to consider paying for seeds. You do have an increased risk of hermies from bagseed, as well as having no clue what you're growing. Personally, my first two grows were bagseed. The weed was killer, yeah - but out of the first grow, 2/3 was male, and second grow, out of 20, 15 were males, 3 serious hermies, and the last two hermie, but female enough to flower. I'll never grow anything but feminized seedbank seeds again - I feel anything else, for me, is a waste of time and resources.