It depends on how you're using the platform. If you're using it to drive a significant portion of your traffic, I think you'll be disappointed in the results. If you're utilizing it to accompany other SEO/Digital Marketing efforts, it will help extend the reach of those actions. I have found if it's setup correctly, it makes your life easier since you can make an update in the Yext Platform, which will update across other platforms, without having to log into multiple places.