AmCharts is outstanding by its simplicity to use. You import it, configure the options, put your data, and *ba dum tss* you have your magical graph out there standing proudly on the web page. I also really like the design choices they made. It is beautiful and pleasing to the users' eyes. Also, the charts available are really nice and diverse.
One of the things that I didn't like, is that there was no vertical zoom on the line charts, as I needed that functionality in my application. Also, it is not very performant when you throw at it a huge amount of data points, which make it behind some of other charting frameworks out there.
If you need to plot a huge amount of data, amCharts may lack the needed performance to do that. Otherwise, it is a good option to consider.
I needed a charting framework that can show historic data from IoT sensors. AmCharts managed very well the data in the tile-value format and performed well in most cases. Its beautiful design make it less work on the css part which was nice.