I feel it's better than nobody having it.

That might be true for awhile but technology tends to become cheaper and more available over time, barring artificial constraints like the types of regulations on drugs in America (which is a social issue, not a tech issue).

Then of course the risk is that a lack of genetic diversity wipes people out all at once, so some care is needed.

Also there already is a competition to become super beautiful, it's called sexual selection.

15 years ago, only the super wealthy had big flatscreen TVs. Now everyone's got them. If it takes 15 years to go from only the super wealthy having gene enhancements to everyone having them, that would be fine by me.