User friendliness and ability to pinpoint projects easily and time associated with each. I also like being able to transition ownership based on the stage of the project.
That it is really user friendly; never heard of Ravetree until I began working at The Bookkeeper. Wonderful tool to track and prioritize tasks.
The ability to upload file versions within the same upload and select which version you'd like to view. This keeps project files/uploads organized and helps us to easier find and look at versions.
I have trouble finding tasks that I have marked complete. If i don't know the specific name it's hard to find them.
The lack of stability and the appalling support.
It's a mystery why that aspect of PM is so neglected by many other apps.