I had some installation issues which is why I only give 4 stars. But now that everything is installed correctly without leak, I am very satisfied. The shower works great. It really seems to only have advantages, both from a cleanliness perspective and an environmental one. It also totally solved some irritation issues. Love it.
The installation was a bit tricky. The T had a defect but I could quickly contact Renarumpor via chat and get some support. A couple days later I got a new T. I still had some more issues with water leaking, but with a bit of DIY work I could solve it. I think the water-in pipe going to the toilets was not exactly the type that is best suited for the T, so I had to replace a plastic joint.