I had buy it from Flipkart,  its very useful for everyone in daily life….I observed some minor problem due to installation and return it first time but they give me second piece by replacing earlier one…..now I am working on it and making my video lectures by using it. In classroom along with other softwares like evernote, classnotepad, Classroom presenter, etc I am using it effectively. For the notes or lecture purposes you should install evernote, you can also write on PPT too by using it. 

There are various uses of its, Painters are using it to make the digital paintings without water colors. If you are teacher and interested to use digital pen and graphics tablet in classroom teaching I found it most suitable. Why? because on whiteboard when one teacher writes he/she can not focus on the audience and sometimes drawing is difficult to draw on board. At this moment this tab is useful, by using it you can see the classroom response, and simultaneously can draw the diagram or can use from the PPT. Your writing displays on the screen of monitor that can be projected on white screen in classroom through the projector also. So by this way you are not only using the whiteboard but also incorporating the media file trough this. 

You can find the same product with same price at Flipkart and at Amazon