Uncaged Ergonomics Adjustable Keyboard Tray Silver

I have this same unit, but it’s for a laptop, not a keyboard.

Looks cool, especially being able to slant the keyboard *downward *& attach the mousetray on the left or right. Does anyone have experience using & adjusting it various ways over time? E.g., is it hard to change the height/tilt over the day (I can’t exert much force with my hands), or how much pressure/weight can you put on the trays before they slide down? Thanks~

(*Why *do almost all “ergonomic” keyboards slant upward–or at least have the option to do so–when everyone knows that makes it *more *likely the user will develop carpal tunnel syndrome?? :-\ )