Very good sound quality... they work perfectly for two years... very good battery for over 10 hours!!

Quite good headphones, they just become tiring after a long time and you want to take them off due to the pressure they exert on the ears. In terms of sound, they are average, especially if they had a bit deeper bass, although this is also a matter of taste. It has a pretty bad microphone.
Are they worth it? Actually, if they were priced at 40 euros, they would be good, but at 70 euros they are not worth it.

After about 2 years of use, the left earphone developed a problem due to folding, resulting in either not playing or producing an annoying parasite sound. I believe that the construction should be more careful in these areas. After all, we are talking about JBL and not a random company. Nevertheless, I consider them very good for my own requirements, especially in terms of bass. They are lightweight and very comfortable on the head, I use them for walking and running. The cushion material is of good quality and does not hurt your ears even after prolonged use. No, they do not isolate the sound of the environment because they are on-ear headphones. The control buttons are a bit uncomfortable in terms of sensation and touch, but I think it's a matter of getting used to easily finding them with your hand. For the money (I bought them for €80.00), I think it's a fair purchase and the average listener will be very satisfied.

I bought them about 9 months ago and I have been using them almost every day since then.
I am a clumsy person and I have broken many headphones, but these ones have lasted for 9 months and they are still working. The sound quality has not deteriorated at all and it is very good.
The only thing I don't like is that the controls for volume and changing songs don't work with a cable, they only work with Bluetooth.
The Bluetooth has started to malfunction, but I think it's due to my clumsy usage rather than the model itself.

After 1 year of use, I have to say the following.
In terms of sound, I am 100% satisfied, as well as with how comfortable they are. My issue is that I bought them for exercising, but due to their weight, they easily fall off my head. The fabric headband makes them more comfortable, but if you sweat, there is a problem. For the purpose I bought them for, they are completely useless.

The bass is a big failure, I don't recommend it at all. Also, why don't they put AUX?? Disappointing.

Unbelievable sound quality!!
Very good build quality!!
And the battery life that JBL provides is 16 hours when the volume is at 100%!!
When it's around 50-60%, it lasted me over 24 hours!! (with proper initial battery calibration!)

I have them for about 8 months.
At this price (59 euros) it is very good value for money.
Very lightweight to the point that you forget you're wearing them.
Satisfactory sound (and a little more).
Just because recently the Sennheiser 4.40 dropped a lot in price, they might be a better alternative.

Owner for about a year. Use of gym. Connected via Bluetooth with up to 2 devices, which can be seen simultaneously. A major advantage is that it automatically detects and stops one device that is playing music, for example, and prioritizes the slope. After it ends, it automatically continues with the media of the other device. Disadvantage: the process of connecting the two devices is complicated. That's why I would try to buy something different if I change them. Once connected, however, there is no problem. Sound, volume, and isolation are great.

PLEASE DO NOT BUY them, I had them for a month and I sold them because I couldn't bear to wear them for more than 30 minutes, they hurt my ears terribly and the build quality is unbelievably bad for the money you're giving. The plastic that holds the ear cushions makes noise when I wear them and it doesn't have any premium feel at all

I have had them for 4 months, they comfortably last 15 hours on a single charge.
Some songs that you have been listening to for years feel like you are hearing them for the first time with these headphones, incredible clarity in sound and they also have enough volume. A test in a store will convince you how much better they are than the beats that cost twice as much. I hope I helped someone.
edit 13 1 2021
still going strong

Amazing and comfortable headphones after five months of daily use, I can confidently say that they are one of the top choices in this category. They embrace the ear even after hours of use. It's worth mentioning that the connection is very easy. THEY ARE WORTH IT