Sannie is the man. Ive tried; Killing Fields F4, JackHammer, Herebei, Extrema, MadShack, Chinese KF x KF#7, and JackBerry F4.
Lots of purple phenos with the JackBerry and KillingFields, very similar except for flowering times. I got a DJ Short Blueberry indica influenced pheno from the JackBerry F4, and have never seen anything so beautiful. Blue in color, early in flower, solid yield, easy to clone and root, smelled very potent. Like a very large skunk wandered into a blueberry patch, and then stepped on a landmine.
Taste was blueberry muffin diesel.
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another awesome blossom i had was a green pheno from the chinese kf x kf#7 which smelled and tasted like juicy fruit and green sour apple candy. drop the temps on them low in the last 3 weeks and you will be blown away.