Review for the headphones at 49€
Sound: The headphones have three playback modes. The balanced mode suits me better. I would compare the sound quality to the JBL T290, which cost around 30€. For the 49€ I paid for the JLab GO Air, they are definitely worth it. I recently bought a pair of SONY MDR-XB50AP EXTRA BASS and I can confirm that the Go Air is much better.
Noise isolation: The product has very good noise isolation and I have been enjoying it since I got them. You won't have any complaints.
Volume: In balanced mode, the volume is very loud, enough to satisfy you and the person next to you. 10/10
Hands-free: It includes all the shortcuts you would want with any hands-free headphones.
Microphone: The microphone is average. It has technology that isolates background noise, but it doesn't do it perfectly. However, it is definitely passable.
Case: It has an integrated USB cable for charging, which is very convenient. Theoretically, it can fully charge the headphones up to 3 times. I carry it in a cloth bag to prevent scratches and I recommend you do the same.
Connection: So far, I have connected it to my Redmi Note 7 and I have only noticed 2 or 3 instances where the signal momentarily cut off, but that is due to the connectivity of the phone, not the headphones.
Delay: There is a slight delay, which is expected from Bluetooth headphones, but it is a short period of time and won't bother you after a few hours of use.
Comfort: 9.8/10. No complaints, they are a bit warm when you take them out of the case while charging. Some features of the headphones, which I use for many hours every day, have proven to be very convenient.
Overall, it is a good purchase but the price is a bit high. I would say that around 45€ is the ideal value for the product. I highly recommend them for anyone looking for wireless buds in this price range. (And I mean it, I'm not trying to justify the money I spent, compared to Xiaomi buds, these are amazing!)