The 540 was perfect for my DJI Ronin S gimbal! The Ronin comes with a styrofoam case, but that case requires you to reset all of the balance settings. I was able to customize the 540 foam so that I could keep my gimbal balance settings in place. This saved me a lot of time and let me start using the gimbal with no delay. Comparable hard cases were all in the $240 range, making this by far the best option.