It is very easy to use and it has great features like email integration which makes our work easier by integrating emails in salesforce as well as sending them out via mail merge.
I dislike only one thing about this product; its price. If we have more users then there would definitely be problems but if not then i don't think so. We are using this software for managing leads.It helps us to send bulk mails to all contacts of lead who are subscribed through different channels like phone calls, social media etc.