As of yet, I've grown two plants from this line - one indica dominant, one sativa dominant.
Both phenos are very vigorous, lush and sturdy, while you can clearly distinguish them by their structure, leaf- and bud shape. The sativa pheno's internodes are a little wider and the stems are a little thinner, but strong nonetheless. Both phenos demand high amounts of nutrients and yield very well.
One negative aspect lies in the fact that the strain tends to preflower heavily and starts to autoflower as soon as the plants become even slightly rootbound. Keeping moms around may be a challange!
Of the two plants I've grown, the sativa pheno is definitely the better one, especially in terms of finishing time （52 days compared to 62 days for the indica pheno） as well as in terms of smell and taste. Both carry a highly distinctive synthetic Berry-Candy aroma, though the sativa pheno's smell is dominated by notes of sweet grapefruits and tangerines, which are really intense and explosive! Overall the buds of both phenos have a very perfumy touch to them.
In both cases, the smell translates very well into the taste, though again, the sativa pheno's taste is A LOT stronger and better and lasts a lot longer!
While the indica pheno provides a very calming and relaxing stone, the sativa pheno is slightly racy, activating, thought provoking and psychedelic - just as the grapefruit aroma, probably a residue of the C99. In my opinion, the indica pheno has the better high though.
Overall, American Beauty is a very nice strain that provides a highly unusual and nice aroma / taste, while the sativa pheno seems to be the one to go for, especially because it's done in little more than 50 days. [Indica pheno: 7/10; sativa pheno: 9/10] --〉 overall: [8/10].