Here is a description from the site:
What is #3DBenchy?
#3DBenchy is a 3D model specifically designed for testing and benchmarking 3D printers. It is a small recognizable object that you can download for free, make and share.
#3DBenchy is designed by Creative-Tools.com as a calibration and torture-test part for 3D printers. Here you can download the STL-file and read more about 3D printing. #3DBenchy is licensed under a Creative Commons License.
Official 3DBenchy video:
On a personal note: first thing that came to my mind was "This is so great and useful how come I didn't think of this and maid it myself!" Kudos to the developers!