'good not only' is correct and usable in written English.
You can use it when you want to make a comparison between two or more things. For example, "The weather was good not only today, but also yesterday."
"We think that's good not only for Finland, but ultimately for Nokia as well," he adds.
But Firefighter Lyons was good not only at putting out fires.
We felt good not only because we had breached a racial barrier as old as the Republic.
Adult complexes are good not only for developers, but also for the town governments that approve their construction.
Which has been plenty good not only for him, but for the winning U.S. Postal Service team that he led.
And Miller is good not only for theater but also for a deciding 3-pointer to force a seventh game.
It exemplified her belief that capitalism was good not only for the rich, but for people on modest incomes.
Their keenest advocates say that environmental taxes will be good not only for the earth but also for the economy as a whole.
And if natural gas displaces coal, then fracking is good not only for the economy but also for the global environment.
"It is time we Mexicans distinguish ourselves for something good — not only for the violence," one participant in the kissing record said.
That is good not only for them, but also for their employers, which will benefit from greater employee engagement and productivity.
