I just received 4 of these headphones. I needed a small enclosed headphones quickly enough to make cab back to the home studio recording. I think they largely fulfill this role.
I have heard this morning, and I was really impressed by the sound (relative to price).
I also have a AKG K58 and a K271. of course it's not worth the 271 but not next to the K58, feels!

Unbeatable value for money. Approx. € 20 headphones, do not look any further (most of the time, that record musicians are unable to make the difference with a prestigious ... A K271 headphones for every musician would really give jam to pigs of after me)

Small reservation: Remains to be seen if it is really enough to record ended without much repisse ... (but it looks)