I am using this for a few years now for my prime 4 and I must say it is a good investment for carrying around my prime 4. It is well-made and a robust case, but I must say the handles are not made for carrying this too long. Taking it from the stage to the car, yes. Taking it from my apartment down the stairs to the car, yes.
Carrying it from my apartment 2km to the train station: NO. Of course the prime4+case is quite heavy, but that's not the point: The handles are too thin and the pads on the handles are too hard. If you ever carried something heavy with a thin strip of cloth or something, you know how that can cut into your hand. Its the same with the handles on this.
But if that's not a problem for you, then this case is definitively a good investment!