Yes, do buy a good quality spoke wrench. There are basically 3 different sizes for the nipples most used in the market. I like Park wrenches for their quality and fit.
Or buy a multi-size spoke wrench. But take note, quality varies.

With one, you can inspect your wheels before rides to detect loose spokes. All wheels eventually go out of true a bit from potholes, miles, etc. You will be able to true them back.
A properly tensioned wheel rarely breaks spokes.
But you can have an accident on the road that can snap spokes. Having a spoke wrench on you will allow you to try to straighten out a rim enough to get you home.
It's a small, valuable, essential tool for any biker who depends on their bike.