Bought the quiet comfort ultra buds because i lost my Sony M3. Worst earbuds ever. They loose connection several times per day, noise cancelling turns off or gets weaker within 30 mins and i need to put them in the case shortly to restart them. I will go back to sony, even if the sound quality is great

I've had mine for about a year and never had an issue. I have several types of ANC devices, but keep coming back to Bose. The Ultras are my all time favorites.

The worst headphones ever. I have the quiet comfort ultra. I already had them 7 times in service. Every time I'm getting new pair which doesn't last longer then 6 weeks... cracking sound, no sound in one headphone, loosing the control of noise canceling. Very poor for the price. Get yourself other set from the competition save money.