The cage fits perfectly on the Sony a7 IV and feels like it is an extension of the camera when strongly attached to it. It is a bit challenging to put around the camera the first time but once you figure it out, it is really easy to do.
I mainly use it to be able to shoot vertical video on my Ronin Sc and it works like a charm for this usage. There are many places to screw accessories to the cage, like an external monitor or a microphone. The rig even comes with a magnetic screwdriver that sticks under the cage and is always useful to install the camera or accessories on it.
I really like this SmallRig cage and would recommend it to anyone who is looking for this type of rig.