Yes I have been hearing a lot about this recently.
I can see both sides - obviously most reasonable people are not going to want this sort of knowledge used for "designer" babies.
That being said - we currently try to prevent diseases and other serious defects - is trying to prevent it while an embryo much different? I have no issue with trying to prevent any sort of disease.
My overall opinion - is with any sort of medical treatment there are side effects or potential other issues. Why would any reasonable parent or especially a doctor want to risk a side effect to get a "blue-eyed, blond hair" baby for instance.
Not that this could not happen, but I think the chances for this becoming a designer baby thing would be rare. Most parents look forward to having a healthy baby.
Doesn't mean it wouldn't happen at all.
(maybe I am just an optimist)