These pull-out shelves, for me, are over-priced, but they do look good and also feel very sturdy. I have placed many kilos of cast iron pots and pans on them and so far (a few days in), they seem to be coping well with the weight.
The price aside, the only thing stopping me from awarding five stars is the fact that the supplied screws are not high-quality and do not contain ferrous metal and therefore do not stick to magnetised screwdrivers — which made installation quite difficult.
Overall I am happy with these shelves.
FK 
