yes, 12/12 from seed can be very good.
in less then 80 days you can have an oz +.
these theads may help
12/12 From seed to Harvest (1 oz Honies)
Can I Grow A Pound of Dope in 9 Weeks?
The 12/12 From Seed Club, Show off Your Girls
some pics of 12/12 grows close to harvest...