Not a bad product but could be more rigid. The mouse platform is plastic and has a bit of flex on it and will probably break if more than the pressure of a mouse and hand is put on it (ie. don't put the whole weight of your arm on it or press down on it) At it's full 50cm height it needs a solid surface under it, not carpet, or it might tip forward
That said, it seems fairly stable as a platform when used at any height under 50cm, and with 2-3 kg on it max. It will likely struggle with a 17 inch gaming laptop, but will work well enough with a 13-15 inch device.