The most helpful feature to me has been having all my projects in one place which was impossible before this product came out! Also it makes communication much easier with other stakeholders as I can keep track from anywhere at any time rather than just when they are available.
There really isn't anything that i dislike about it but if you have never used ppm software then there may be some things that don't make sense or aren't clear until after using them more so do not hesitate because once your get into it everything will become clearer!! We were able to manage our workflows very easily without making many changes and we also got better visibility of what needed to happen next.