The ability to create segments that are not only predictive but also have an explanation for why they exist makes this product very powerful! I wish there was more flexibility in creating new profiles, however once created it's easy enough to add additional fields/variables as needed without having to go back into every profile manually after adding them all at first time use.
If you're looking for something simple yet effective then look no further than dynamic predicitive audiences - we've been able to make many changes since implementation including reducing our data storage needs by over 90% while increasing overall accuracy across multiple campaigns & channels (email + social). We were previously using several different 3rd party solutions which made managing so much easier when compared against what DPA offers out-of-the box such as Segment Builder or Custom Fields Manager. There really isn't anything bad about DPAs products either -- everything has worked flawlessly thus far and continues to do.