I have had them for 10 months now for office use. IT support.

Guys, we're talking about Sennheiser.
First in quality and most importantly, they deliver what they promise they can.
Let's be reasonable, it's a €20 headset primarily for office use. So forget about audiophile situations. Nevertheless, the sound is much better than most headphones in this category, as well as cheap 2.0 speakers that many computers have. And the sound isolation is average for this category. It only falls behind over-ear headphones that have leather on the ear cushions.

Let's start with the negatives, or rather the negative because there is nothing else, and to be honest, this is a detail.
-The cable connects to both sides of the headphones, resulting in them getting tangled sometimes on the head. Especially when you have taken them off and "wear" them on your neck.

Positives:
-Satisfactory build quality, made of plastic with a good amount of flexibility. They fit well on the head and do not bother.
-Lightweight (well, it's logical for €20 plastic headphones)
And the best for last.
-The microphone! Excellent quality and most importantly, the noise canceling works flawlessly! Chaos can be happening in the office and everyone tells me (because I ask them) that they can't hear ANYTHING or just a very faint noise. In other words, I may not hear myself speaking due to the noise, but my conversation partner hears me 100%.

If you are looking for office headphones or for everyday use at home, buy them yesterday!
There are also models with dual jack and USB for all types of connections.