I used to have a cheap LED panel which I used when digitising my film. It did the job, but I have since bought the Kaiser you linked to, and it is excellent.
To my eyes the light from the Kaiser panel is perfectly even over the whole surface, whereas the cheap one certainly wasn't. The Kaiser also has a higher CRI, and I have noticed the difference (i.e. more accurate colours) when inverting colour negs especially. Also it is much larger, which helps. In summary, worth the money IMO.