I like that it's easy to use, has lots of templates which are very customizable as well! The only thing is when you have too many emails in your list - sometimes there can be some lag time between sending an email out for recipients who haven't opened yet or replied back (which could mean another round goes by before they get their response). It takes awhile but once we've set up our template/sender profile everything runs smoothly after that point. We're using this product at work so all employees know what kind of content will go into each mailer sent from us via MailChimp. This helps them understand how important these communications need to be while also helping keep everyone informed about upcoming events & activities throughout the week / month etc.,.