I use it for almost a year.
The little trouble is that the earbuds are not very large and can not make the rim of the ear, making it very uncomfortable for long pr costs.
I have tried other models jms but the sound reproduction seems to me excellent, not too low unlike some headphones. We easily detect the sound imperfections that are not audible on other Systmes of costs.
The quality is on it again but if I had a choice I would take the K271 pr + 20 euros.