It is very easy to use and it also provides some nice graphs that help visualize things like request rates over time.
The only thing I don't really love about this tool is that they have not been able to make any updates since 2015 or 2016 (I think?). Also, their pricing model has changed recently too - now you pay per month for every AWS account used in your organization. So if there are more than one people using S3STAT then you will be paying for each of those accounts separately! We've had issues with our CDN being overwhelmed at times but we were able to figure out exactly what was going wrong - which was great because once we fixed the issue everything worked as expected again.