I’ve got the Cymarc ones, they are ok, but what I have found, the thumb screws work loose, you end up tightening them up, then the 3D printed thumb wheel breaks, as its not very strong. I got one replaced (Marc sent 2 just in case) and the replacement broke as well, so now on third one. However, the screen still wobbles, even with brace, due to the poor design by BMW. The cheap plastic slider mechanism, hidden down next to the headlight, has too much play in it. Why BMW couldn’t have designed this better, even I can see that the sliding pole and cheap plastic attachment, is going to introduce a lot of free play, resulting in a wobbly screen. Maybe someone could come out with an improved mechanism, with better tolerances.