I like that they offer many different ways to get people to sign up for my newsletter. The best part about it is that they are constantly improving their service. Sometimes, I find myself having to send out several messages before someone actually signs up! However, if you're looking for a service where you can send out mass emails and newsletters, then this is the way to go! I use them to send out email campaigns for my business. They make it so easy to do so, and I've been able to grow my list quite a bit.