I love how easy it is to upload a list of emails. I also like the fact that I don't have to manually validate each one of them. A few minor issues, but they are not enough to distract me from using this service. I highly recommend this service. It is easy to use and will make you look like a pro in no time. I use this service when I get bulk email lists. It allows me to check the validity of each email address in a matter of seconds. I like how easy it is for me as an individual user, or even business owner/administerr etc., that can set up rules within minutes! Sometimes they don't have all options available so make sure your account rep knows what's possible with their product before purchasing (as sometimes there are restrictions). Also try using this software if sending out emails from time-to-time - i've found when we send mass mailings through our website these bounce rates go down significantly!!