I'm eight weeks in 12/12 with Reserva's OG Kush. My first time growing it and I must say it is an impressive strain. It smells like straight up Pine Sol and grows vigorously no matter how much LST or supercropping is administered. Be careful, although it's called a Kush, there's nothing "kush" about it. She certainly does stretch during the first 4 weeks of 12/12 but the buds really do thicken up in the last weeks.
I've got about ten different strains in my garden flowering right now and I'm considering growing the OG Kush exclusively. I'll let you know in a few weeks how the high is. I can't get over how good/strong it smells