Have had mine for more than a year, fantastic headphones! Noise cancelling isn't amazing though
These are great headphones. I'm just worried that they will develop the dreaded on-off problem that's plagued the mk 1 version. I'm on my 3rd set and the same random turning off and on again has started. Sennheiser say it's not covered by their warranty even though it's a recognised issue and is clearly a fault in the design. (Magnet-triggered switch on the right headphone turns power on and off, until it starts to go faulty).
Ordered of Amazon Warehouse France earlier today for £106 delivered like new. Hopefully helps someone.