I haven't tried it, but it looks to be aimed at those that need a lot of detail and calculation functions, like a researcher.
If you're looking for something more basic, but still very usable, there's [app]SmartChart[/app] which I've tried, and I'm only waiting on the update that allows three sets of data to be graphed on a line chart, and it'll fit my needs well.
I also saw [app]Mobile Charts[/app] that looks basic, it appears to require a connection to Google though.