The ability to send out multiple campaigns at once, without having them all load up my inbox with too many messages. I could also see how much each campaign cost so if i wanted to change things around or cancel one of those campaigns it was easy enough as well. Sometimes its hard when you have more than 10 different ones going but other then that everything seems great! If your looking into this product make sure they are very reliable because sometimes their servers go down (which makes me sad coz im paying $20/month). It helps us be able to do mass mailing which saves time since we don't need someone to answer questions about our products everyday.