Akkio is exceedingly user friendly. The UI is clear, the interpretations provided do not feel overly "black-box", and the tool is scalable.

Akkio is fast, easy, intuitive, and has the best performance of them all. It integrates with just about everything, and has extremely fair pricing. The staff is extremely friendly and helpful too. I tell everyone I know about Akkio, and it really feels like their product is 10 years ahead of their time.