I use this headset for about two years.

I in no way endorses the two previous notices ...

To be honest I had the HD200 model for several years before I get the HD210 for a second headphone for my travel.
I was able to make a direct comparison. And much to my surprise, there is no difference!
I liked her already garnd brother dressed all in white, now I can say that the little brother (black) is simply the copy of an audio playback standpoint.
What I like about them is that they HD200/210 recreate the sound so clean, unpretentious, and while remaining neutral on all frequencies.
No need to inflate the bass ... The sound is as it should be: without unnecessary tinkering.
The comfort of the headphone is rudimentary, but it covers the ears well and so reduces outside sounds (maybe not enough for use in nightclubs, where the sound is unfortunately often too strong), which is probably the point low key.
Despite this and a price of 35 euros in supermarkets (I have unfortunately not seen ...) the HD210 dethroned by far all the headphones on the market - surprising but true! - Both on a "sound" that "wallet" (Dumoine in the mid-range)
My choice, if it were to do again, would be the same.