It's easy to use tool for verifying an existing list or adding new contacts into our database which helps us in reaching out more prospects with lesser efforts.It has all features of verification except mobile phone numbers where it lacks some options like "I don't want this number" etc.. I would recommend them because they have very good customer support team who are always available online to help you if any queries arise related to their product.We used that service as part of our data collection process before we could send bulk mails to potential customers.