EmailOversight has a great UI and is very easy to use. I have not encountered any issues with the product. The customer support is very responsive and helpful. The only downside I have is that it is a bit expensive. EmailOversight is helping to ensure that we receive emails from people who actually want to be on our email list. This is a big boon for us, as we are a small business that receives a lot of emails, and we want to make sure that we are only reaching people who are interested in what we have to offer.