The headphones have good battery life, but what bothers me is that they fall out of the ear and sometimes have connection issues. Before these, I had some Huawei earbuds and they were the best in my opinion (but they cost around 60 euros). If someone can spend a little more money, I recommend getting something better, but for the price, they are a good option

I bought them mainly for running and discovered the comfort of wireless and the convenience of leaving my phone somewhere in the house while I work or do chores.

I've had them for about a month and the first thing that bothered me and made me regret the purchase is the fact that one earbud keeps falling out and I have to readjust it every 5 minutes in my ear. I can feel one earbud moving inside my ear and changing position slowly without me running or moving my head. It just fell like that while waiting at the bus stop.

The battery is very good, I forget to charge it. It connects easily to the phone but sometimes you have to put them back in the case and then wear them again to connect.

The sound is average, not very clear but decent for the category of earphones.

Overall, it's good for its price, but the fact that it can fall out of the ear just cancels the whole product for me

Apart from sound quality, battery life, and connectivity, it is also very durable against falls, which is inevitable, as well as water contact as it has happened to me (generally a high-quality and sturdy product).

Impeccable sound, the battery lasts a long time, they don't fall out of the ears if you adjust them correctly with the rubber ring, they don't bother me in the ears and all of this at a perfect price. I have had them for 5 months now and they are amazing!

While they have good features (quick connectivity, good sound in speech and music, good battery), unfortunately they have an issue with connectivity between them. At least in the 2 MiA3s that I tested.
Meaning, either on their own, after 60-90 minutes of music/video, or earlier after a call (while playing music/video), synchronization problems between the two earphones start, resulting in momentary but continuous interruptions in sound. Particularly annoying... If you take out one earphone and put it in the case, the interruptions stop and you can listen normally with just one mono earphone. To resynchronize the two earphones, you have to put both of them in the case for some time (I haven't found the ideal duration yet). It's a shame because in other aspects they are fine...

UPDATE 20/8/2021: The charging case suddenly stopped working without any reason. This could happen with any product regardless of its price. However, in this case, the next 2 units turned out to be defective as well...!!! They didn't work at all. Luckily, the store where I bought them was in my area, otherwise... Now I have the 4th one in line (let's see for how long...)
Anyway, I don't know if it was a defective batch, but a 75% material failure rate is excessive...
That's it.

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!)