My opinion about a news of the Genome Editing

I read this news, http://www.technologyreview.com/featuredstory/526511/genome-editing/ in order to be informed of current medicine.
I think it's very impressive that currently can mold the DNA in such a way as to be expected, although I bother some that experiment with animals, as it says they are well looked after by professional trainers and that leaves me in a way quiet.
One can not imagine that level could get medicine if it continues to evolve gradually as seen in recent years, and one wonders if immortality is possible and something that would bring problems.