The service helps to clean up the account from spam and also allows you to identify inactive followers, from whom you can also get rid of. This is especially useful when promoting a commercial account, although I think it will also be beneficial for non-commercial ones. A demo is available, which is a plus, as you can test the functionality and understand how the service works. That's exactly how I started using it. As for drawbacks, I should mention that the prices are listed in dollars, which creates a dependence on the exchange rate.
