I had read reviews and learned of chromatic aberration for his one, but that's the type that is at edges of images and only if you really start looking at pixel closeups. This is way, way worse than what reviews indicate.
I've taken a lot of shots at 300mm and while I haven't examined with fine tooth comb for chromatic aberration, the shots look very good (for a sub $1000 zoom lens). It really would be a great travel lens if not for this series defect. I'll probably try a replacement before giving up on this model.