The phrase "as good useful" is not correct in written English.
It seems to be an attempt to combine two adjectives, but it lacks proper structure and clarity.
Example: "This tool is as good useful for beginners."
Alternatives: "as effective" or "as beneficial".
While Google Maps always did a good job of giving you detailed transit directions (though it's often nowhere as good and useful as CityMapper's more detailed directions), the process generally involved keeping track of your own progress along the route.
An item that looks as good as it is useful.
But the ability of state and local officials, as well as the private sector, to prepare for threats and to respond to a disaster is only as good as their ability to receive useful information, understand what it means and act upon it effectively.
Civic republicans accordingly have been at pains to show the contrary that civic virtue should be understood as a strictly instrumental good, useful in establishing and maintaining republican liberty.
But for this active and useful little craft with its wiggly diagonal propagation and useful character, it is as good as death.
Though not as good as the fruits, the roots still have some useful nutrients inside.
Economics as a useful predictor of anything is about as good as astrology (or maybe meteorology).
Possibly useful in a pinch, but definitely not as good as something like the Helio Drift.
For Nokia and Microsoft, the app gives the companies another key app to continue to fill out its portfolio and prove to existing and potentially new users that devices are just as good and useful as their bigger and more established competitors, namely devices built on Android and Apple's iPhones — the gold standards for apps and usually the go-to platforms for developers.
