Lack of headroom or SOG should be the only reasos to flower a plant this early. So unless, you have 25 of these plants or less than 6-7 feet of headroom, then it's ok.
Although I'm not sure about potency, yield will definately be down.
Within the first 2-3 weeks of 12/12 your plants will most likely double in height. A good idea for short plants (and better light penetration) would be to LST them. Make them into little bushes with lots of branches (and buds).
Alternating nodes would indicate maturity and the ability to produce the nicer buds.
Physically, your plants loook very happy and healthy.