Cool thread.
I've done a cross between a White Widow female and Purple Jems male (very purple pheno). So far I've only grown out a handful of the seeds so I can't give any precise data, however it seems that there is some percentage of autoflowering phenos. Due to limited space I had to kill some and only keep one good plant. That one didn't autoflower however it did get a nice purple hue in the buds and came out a lot stickier than the original Purple Jems. I don't know exactly what genes the WW mother transferred, the taste and smell reminded more of the jems than the widow but the hit was a lot more spiced up. Nothing you'd take before sleeping, rather something to get your brain working in the morning or early afternoon.
I love to do these crosses. Especially with the free seeds you always get nowdays with your regular order. Just pollinate some lower branches and your sinsemilla will still be safe plus get something to experiment with in the future...