Owned a M4U1 for 4 years now. Hasn't broken on me yet but after buying other headphones similar to its original pricepoint, I've got to say it just isn't comfortable enough or sound good enough to warrant the purchase. Design is ugly, plastic gets scratched to hell, earpads are small and are almost on-ear. My ears got very hot and uncomfortable after an hour with them on. I enjoyed the sound when I first got it (it was my first headphone that cost more than $200, after the M50x)... however I can't listen to these for more than testing purposes anymore. They just sound wrong compared to my other headphones. Very closed in and doesn't sound very clear. I think closed headphones today have much better options at both cheaper and higher price points.