What do you like best?
The flexibility of the system allows you to manage every part of your process. We've managed the research stage, design, development, and even user feedback and testing. They make really great use of space, and the experience from desktop to mobile is quite seamless.
What do you dislike?
I really wish there was a way to chain (or maybe group) stories together as an ordered list. Tags and Epics create un-ordered lists, but sometimes when you're managing a digital product, there's a really good reason to do the stories in a specific order, and sometimes getting developers to keep them in the correct order is like herding cats.
Recommendations to others considering the product
Because of it's flexibility, Pivotal can get messy quick. It's important that the whole team is on board with your process for managing what you're working on and how Pivotal fits into that, or it can be really easy to get lost, or work over top of someone else's work.
What business problems are you solving with the product? What benefits have you realized?
Solving customer problems, managing those requests, easing internal work load, increasing conversions... The flexibility of Pivotal is what allows us to use it for everything.