Hi guys

I have just ordered a phantom 4 and wondering what SD cards people are using.
Thanks
Ben

The P4 specs say:
Supported SD Cards        Micro SD, Max capacity: 64GB. Class 10 or UHS-1 rating required

Spending more to get the fastest card will get you no better performance as the max speed is determined by the P4 camera, not the card.
Before you fall for the popular chpoce of getting the biggest card, think anout whether you want to keep many flights on the card and put your images at risk every flight or if it might be a better idea to have several 8 or 16 GB cards and swap every flight.

Just to add to that, with still photography the speed of the card is not an issue, but if you are shooting 4K video, then the card must have a WRITE speed of better than 60 Megabits/second. If it is slower, it will not keep up with the recording process. My recommendation is for the Sandisk Extreme or Extreme Pro series of cards, not the Sandisk Ultra, it is too slow. As Labroides says, better a bunch of smaller cards. start at 16GB for video purposes, because if you start the camera before you lift off, then fly a full battery, you will use somewhere between 10 and 14 GB of space.

Thanks guys great help will get a couple of 64gbs to go travelling with.