Bought 3 for my apartment. And it's good that I agreed with the store to return the goods if I just don't like it. Even when I turned on such fans in the store, I noticed that all 3 models exhibited (differed in color) worked differently. In one, the engine hummed, in the other, the membrane rustled noticeably (such reviews are also found). But in general, I didn’t notice any special differences from the similar Blauberg at all. Well-read about dancing with quality, I immediately checked it. Of the 3 models purchased, one cracked - marriage. It's good that I agreed in advance on an unconditional replacement within a few days . The membrane did not rustle in any of the models. In general, who wants quiet and high quality, it is better to choose S&P, which costs three times as much. If you want to save money, it is better to buy only with the condition of a moneyback or a replacement, otherwise you can be tormented by proving the existence of a marriage (if the engine is buzzing, for example)