For the functionality offered, at this price point, RankPro is a better than good deal. I've used a large number of rank tracking and analytics tools, ranging from cheap to very expensive, and this deal offers solid value for money.
The interface is attractive, navigation is intuitive, and setting up projects is simple and trouble-free. The server appeared to be a little slow, but not slow enough that I'd describe it as a major problem. Overall, the UX is above average.