It is for sure an excellent app. It is easy to learn how to draw and make quite good drawings. It is also advisable to have an iPad stylus, that helps a lot in making better drawings. Forget it if you have an iPhone. It may be usable for seeing, for drawing the screen is to small. It could have a better interface to Dropbox, like a folder where you can store / retrieve your drawings. You may send it there and open it, but it has to be done manually. Something like the PlainText app. One feature I miss is a mirroring of images. I still not discover how to select multiple objects, except by selecting an area. I strongly recommend this app.