Pro Smart safety features
When the battery is getting low, or the drone has lost contact with the controller, it will return to the starting point. It is also able to detect and avoid objects that you, the pilot, may not be aware of. Then, when you're done flying, the drone can land itself.
Con Awkward to transport
The dimensions for the DJI Phantom 4 are 8.7 x 15 x 12.8 inches. This means that the Phantom 4 will not fit in your backpack, and when properly packaged for transportation will either require its own bag or take up about half the space in an average roller board suitcase.