Pros: Excellent value, good clearity, solid build quality (for a 20$ headphone), right amount of bass, not inconsencities in sound signature
Cons: Fatigueing because it's overly bright, earpads are uncomfortable, lack of sound stage, may sound 'plasticy' with some genres of music, thin cable
The Sennheiser HD201 are a surprise in the lower echolon of headphones, as they offer great sound quality for a very low price and they are a very good extention into the low end price range for the Sennheiser product sortiment, in that regards
However, because of the cheap price, they do lack in design and comfort and overall build quality. This pair of headphones is made out of plastics entirely, the cable has too much length for me and is thin and flimsy. The cushions on the headband feel good and comfortable, but the earpads itself are a pain in the ass because they are too stiff, not breathable and overall uncomfortable - they irritate my ears in under 20 minutes.The plastic construction of the entire headphones feel cheap overall - but the headband itself doesn't break when it's overly bend, which is a strong point. It's very light weight as well - but the clamping force is a bit on the heavy side, maybe it breaks in after a while.
One last surprise on the build side was the gold plated connector - that's weird in this price range.
The sound signature and presence of small details on this headphone is amazing, especially for a headphone for under 30$.The sound curve doesn't have the typical flaws of cheap headphones like bloated basss/lower mids and non-presence of mids and higher mids. Instead, the sound signature seems very bright - even more than my Beyerdynamic DT990s, which are famous for their strong treble - to the point of being fatigueing, especially with very drum set intensive music. However, it's not a unnatural brightness, but you may be EQing these cans - -2db treble seems just right on my FiiO E17 with these. On the lower end, they deliver enough bass for me to be fun headphones - with the downside that they don't extend into the lower bass sections and that they don't have quite the bass quantity reserve in hand that you would expect from a pair of closed back head phone (The DT990s deliver more). The bass loses texture compared to other headphones, too, but that is to be expected from small plastic enclosed drivers.
For a 24 ohms headphone, they need quite a lot of power - they are quiter than my 32 ohms pair of Philips Fidelio L1.
As a final verdict: they are nice headphones for their price, I would recommend them to enyone who wants to take a low-priced look at how amazing Sennheiser headphones are.
I personally use them at home, the cable is too long for convenient mobile use and I wouln't want to be seen with a cheap plasticy headphone outside of my house. It's a good headphone for Classical, if you can live with the small sound stage, as it makes that sort of music really airy. I prefer warmer headphones for Jazz. It's inadequate for electronic genres (lack of low bass) and I find it a bit too bright for Metal and Rock .