Product review (3 stars): Fine eye cup but I've got through several of them
I've had to buy a couple of these. While they work fine, if you tend to do a lot of work in the field with your Panasonic camera, they don't take a beating very well. I use it with my GH4, and take it on trips, where it's going in and out of a camera bag multiple times a day. I've had cracks appear in the rubber, as well as pop right off the camera. A couple times I've found it in the bottom of my camera bag after taking the camera out, and once it totally disappeared which is why I had to buy another here on amazon. I wish they were a little hardier and clamped on to the viewfinder a little stronger, for my use.