well they look very cheap and robust, also a bit heavy and over sized, they manage 12 Kg airplane landing, it means that they can easily manage more that 15 Kg multirotor...do you have to manage all that weight? maybe you can go for a smaller model and save some weight...but you know what you need
if you watch the video you can see that the operation speed is very low, they take several seconds to open...i ever consider an emergency situation
try to imagine that you have an expensive camera and gimbal on your multirotor and you have to land quickly, if your gear doesn't close in just 2 seconds you can destroy both camera, gimbal, props and probably multirotor frame
if I'm flying an heavy model probably i do it becouse I have to lift up some expensive stuff and don't want to save 100 € or $ on the landing gear to seriously damage all the rest that costs thousands...it doesn't make sense to me
obviously this is just my opinion