if i am to believe my friend, it is quite possible that the "G13" he gave me as a gift is probably from barney's farm, and i have similar experience as blazin purps. very vigorous growth, tons of bud sites, stretchy, long finisher (up to 12 weeks i hear).
i just took some crappy pics in the dark of one that i have, it got too tall for inside so i put it in my greenhouse. it is at about 60 days, i can see it going 3 more weeks easily. the colors are due to the extreme cold it has endured, down to 38 degrees on some nights.
sorry for the bad pic, it was dark and i was high.