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I bought this for everyday use, because I wanted a diffuser which I can carry with me as I like to go on weekends away. So far I have managed to fit it to every hairdryer (5+ different models), but it can be difficult on bigger hairdryers. Overall would recommend and buy again, but removed one star as it does tend to collapse when not used carefully.
Very expensive for what it is and not worth it. It's flimsy and bends/collapses while you're trying to use it. I returned this and bought a hood instead for a fraction of the cost which works far better in my opinion.