The installation was quick and easy (Pipo M7 Pro, Quad-Core, 7.8 inches). Similarly, the first launch. The menu is very tidy and the default settings are also very useful. I then loaded a 460 pages document. It appeared quickly and smoothly. I wanted to edit it. Thanks to the setting I was asked if I wanted to save it before. The fuse went too quickly. A Dropbox connectivity, and a read-out function is also provided. Since I only use Android apps, I can the app even with the existing PDF Compare editing apps and there she is, in my opinion, better. The memory usage is normal. Conclusion: On the APP makes me a very good impression and runs much smoother than my previously purchased PDF Apps. It requires no unnecessary permissions or additional purchases. Unfortunately, you can not change the language of the menu. However, this should not pose Hemnis. For this reason I give it 5 stars and a buy recommendation.