I bought the BeSafe Flex FIX 2 after it was recommended by the store staff as one of their most popular models. Both side wings make loud and irritating squeaky noises whenever they move, even when the seat is not installed in the car. We fitted it before buying, but the problem is hard to notice unless you deliberately wiggle the wings. We only discovered it once the seat was in use, since children do not stay still. It is very disappointing for a premium seat, and although it might be a defective unit, the constant noise makes it hard to recommend.