I bought some cx300 from amazon and they are my second pair i have brought from amazon. The first pair I got can in bomb proof style packaging and was a ****** to open. The second pair were a lot easier to open the back just came of . They were sold by amazon.co.uk but i'm just a bit woried as to why the packaging was so flimsy and if they could be fakes. I have tried them out and they sound good (nice bass).