I bought them to listen to music outside, at home, and at the gym.
They connected instantly both to my laptop, which runs on Ubuntu Linux, and to my Sony Android phone.
They provide convenience in use as you can control the sound with touch from the headphones themselves and change tracks.
I don't use them for calls, so I can't offer anything here.
They fit easily in the ears and come with various sizes of ear tips. The only note is that they could possibly be a bit smaller - I don't know if they might cause discomfort for use over 3-4 hours continuously.

It is a very good choice both for sound quality and design. For those with an even bigger budget, the same company offers the ATH-CKS50TW at a higher price, which I have also heard good things about from people around me.

Their case is sturdy.
The headphones connected immediately to my phone without any problems or disconnections (iPhone).
They are comfortable in the ear, they don't bother and they don't fall out (I use them for running).
The sound is very loud, you can't hear anything from external noises.
This company only deals with sound, so everything they produce is good. There's no need to spend double the money to buy a popular product that, in most comments, you hear complaints about.
If something negative happens, I will update.

I have only had them for a week, but I am really impressed. I have never seen such bass in earbuds before.
They connect very easily, I haven't encountered any problems so far. Smart functions with the touch sensors on the earbuds. I got them on sale for 58€, their sound is much better than the galaxy buds+ that I had bought for a much higher price and broke after a year and a half. I recommend them.

Update: One problem I am facing is with the hear through function that allows you to hear external sounds, it distorts them a lot. I don't know if there is a problem with them, it's probably just how they are. I wanted to use it for drums, but I can't use this function.