Hey Tom. We use Server Side Rendering (SSR) in our app and we believe it provides a really good experience for our users. The users see the contents right away and your app feels responsive. Not to mention the SEO benefits of SSR.
Difficulty of setting up SSR depends on your project. If the app is NodeJS based, then it should be relatively quicker to setup SSR. This read could be helpful– https://24ways.org/2015/universal-react/