The interface is very easy to understand - not too much bells ringing from every new feature they add or any kind of confusion while using it. They have really done their research well when developing this product especially because we are dealing with sensitive data (not just emails) that needs privacy protection at its best. I am always hesitant about trusting such services but so far everything has been good for me! Nothing as an experienced user would think twice before recommending them. We mainly deal with email spamming which makes our life easier by doing away with having to manually go through each message one by one looking for suspicious activities like phishing attempts etc.