The free version of TubeBuddy offers some valuable tools that make it worth the download. So I think it's definitely worth your time to use it.
Their premium versions offer a lot more features. We are currently using their "Pro" version but we want their very best "Legend" version, but at $39/month we just can't afford "Legend" right now. If you ever decided to upgrade to a paid version down the road, you can use the promo code "TangerineBuddy" for 20% Off.