The ability to create segments, tag people in your audience with their interests or behaviors is great! There's not much I love about this product atm but that could be because we are using it for its intended purpose of creating targeted lists/audiences so maybe there isn't anything out-of -the ordinary here? We're able now target specific groups within our client base via segmentation which has proven very valuable as well helping us understand what they want (and don’t) know from me when contacting my clients through emails marketing campaigns etc.