I ran many CH9 Jacks a few years ago and really liked them. I harvested them from 50-52 days and got about 2.5 - 2.75 oz./3 gallon pot. The high was very solid with a definite Jack Herrer quality to it. I can always tell the JH influence in a strain when, if I consume too much I start reeling and get a whitey that leaves me feeling sick. I would mix the CH9 Jack with another strain to avoid the possibility of this effect. The plant has very little smell too.
I really like Jack and have been thinking of ordering some more seeds. Overall I rate it as a solid strain because of the factors I mentioned. It is not a holy grail plant though.