I was impressed with the presentation and looks of both the charging case and the earphones; for the price they feel like a decent quality item.
Pairing to my iPhone was very simple and easy.
Phone call quality is a hit and miss. Works well indoors but doesn't work well in noisy areas.
Sound using the youtube app on my iPhone was as expected, it will not blow you away but there is a low frequency presence and depending on the track you will get a small rumble in your ears at higher volume. In general the sound is perfectly fine for what you are paying.
The max volume on these earphones may not be as high as some people like, for me though it was perfectly acceptable and max volume will have you not hearing anything else. My preference is to have this set at a low volume level so I can hear if someone is saying something to me during training.
The earphones fit securely into my ear and they did not fall out during heavy bag work or skipping.
The earphones survived the vast quantities of sweat during training.