It is important to note that this was done in a lab, not on a person. However, should this technology advance to the point where it could be safely done on someone, I see no issue with this. I don't view this as being any different than any other medical procedure we might do to correct a congenital heart condition, for example. It is vastly different to say, scan for this extra chromosome and then kill the embryo or fetus that has it.
Would be curious to hear what other people think, though.