We are using this product at my work place as an internal tool for senders verification purpose and we have seen significant improvement in our delivery rate. It requires some amount of training time but after that you get used it really quick. This software gives us better insights into our sending campaigns with improved reporting capabilities. I haven't faced any issues or downsides so far till now which i can think about. This system works good even if there's not much network connectivity available. Major benefit i see is its capability to verify email address by comparing them with domain registries list like whois etc., which helps me remove bounce messages from our mail box. The customer service is the best. They listen to what you want and are willing to make changes to their product to make it better. The software is easy to use and offers a lot of features. I like that the software is compatible with Gmail and Outlook. I also like that they have a lot of tutorials available for the software. I do not like that they do not offer a free trial. I would like to try before I buy. They have a great team and I highly recommend them. I am solving the problem of invalid emails.