Personal experience of the MM 550-X

No helmet is perfect in every respect, I do not expect perfection. All comments made buyers are not fair, but that does not detract from the musical quality of the helmet, the most important point that I consider when I buy this kind of product and justifies my 5 stars. I especially enjoyed the small relative volume of the atria, allowing easy transport. I have a B & W P7 I put on sale because, although it has an excellent musical quality, it does not bring me more listening and portability that the Sennheiser. Overall I am very pleased with these headphones I recommend.