I upgraded to the pro version after using the lite version for a short time. It's an excellent plugin with lots of features in both the free and paid versions.
I'm also surprised about the reviews claiming poor support responses. I just submitted a support ticket and received a response that solved my issue within just a few hours.
This is an excellent way to leverage short urls for twitter sharing, affiliate links or just to prettify your urls and a lot of automatic functions to speed up the process of generating urls. :)