You can create charts like in excel for instance - however it is easy and fast to use. ALso there is an API available if you want to use the Chart Tools more professionally and they are free to install and use.
If you combine the Chart Tools functionality with the Google Drive or Google Sheets you gain most benefits.
You can start easily with simple charts but when you try to create more complex presentations you will need to have a look at the API to be able to create the charts you need. So overall it seems easy to learn but hard to master and you have to invest more time on it.
When you are familiar with excel charts you should try this free tool out. Do not expect the same outcome within the same period of time though, since you might need to invest some time in the chart API.
Well since it is free to use and very fast in installation it will be no problem to install Google Chart Tools ( you do not even have to be admin on your computer to do so). When using Google Drive etc. you can share your files without any hassle.