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I bought the 310 because the 110 was good, but I wasn't satisfied with the battery intensity and power, so I went for the 310. It's like day and night in terms of portability as this one has wheels, and in terms of intensity and battery, everything is vastly better. I mainly take it to beaches and outings, and what I have to say is that it literally gets everyone hyped up. It can be heard over 300+ meters away, and I can't imagine what it would do if I plugged it into the power.... Now, in terms of bass and sound, everything is amazing!! The speaker doesn't distort at all, even at 100%. Yes, when plugged into power, it reaches 100% of the intensity and bass. Now, regarding its battery. For a user who isn't outside for many hours with everything turned up, it will be just fine, but for others who want it at full blast for hours, unfortunately, it won't last. I upgraded its battery by adding more cells (batteries) of the same type to make it last longer. I've had it for almost 2 years, and I don't regret at all the money I spent to buy it. It's the best!

I bought it as an upgrade from the JBL Flip 4. The differences are very noticeable in terms of bass, clear sound, and especially battery life. I have the CS model and I have to say that its sound is crystal clear, just like the TL and GG models (TL, GG, CS are the serial numbers of each speaker. Each one has a different number, which can be found on the bottom of the speaker box and on the strap). In terms of sound, it is extremely clear, the highs sound perfect, the bass is clean and distortion-free. Considering its size, it produces a really powerful sound compared to other speakers of the same size. The speaker also has an EQ (equalizer) that helps enhance the sound. The battery lasts 12 hours at 50% volume, 7-8 hours at 80% volume, and 5-6 hours at 100%, which is not bad at all. It is fully waterproof, so you don't have to worry about it getting wet or dirty, even if the charging port is exposed. From me, it's a 5/5 for the price of 120 euros!

If there is water inside the charging port and you try to charge it, all the lights will start flashing, warning you that there is water inside and it needs to dry. Essentially, it protects it from any short circuit. Compared to the Flip 5, which had many issues with water getting inside the port.

4/1/24: Update: I decided to get a second one so they can play in stereo and they sound amazing together for their size. The partyboost feature, which connects them, works perfectly and has a range of over 60 meters, which is simply insignificant but good to have for long distances. The second one I got is the GG model in terms of serial number, and the woofer is made of paper, BUT that doesn't mean it's not waterproof. It's a hard paper that doesn't tear no matter how long it stays in the water (tested!!). In the end, if anyone wants to make a stereo setup, it's definitely worth it. The price has also dropped to 89 euros, making it even more value for money!

After so many reviews I saw, I decided to buy it and it was the best choice. The build quality is perfect, the application is very useful because it has extra options that the speaker itself does not have. Let's talk about the sound, which is crystal clear, the bass is clean, the treble is clean, and overall it is a speaker that easily throws a party, especially when it's plugged in. When the speaker is plugged in, it gets a 30-35 boost compared to when it's on battery. JBL claims 12 hours of battery life with the lights off and bass boost at 0 and at 20/100. When it's at 65/100 with the lights on and bass boost level 1, it lasts for 8 hours, which is very good for such a large speaker. The low frequencies are audible after 32-33hz, especially when it's against a wall. For anyone looking for a wireless party speaker, with a perfect sound, it's a perfect choice.

I have done an unboxing on YouTube for anyone who wants to watch it: https://youtube.com/watch?v=2mvk79_DM_Y&si=EnSIkaIECMiOmarE

16/3/23: If anyone plans to go for a boombox 2,3 or some xtreme speaker, don't do it and instead get this one for the same price, they won't regret it

For the 33 euros I paid, I have to say that it is the best speaker you can find for 40 euros compared to the JBL Go 2, JBL Go 3, JBL clip 3, and JBL clip 4, it is much superior. I compared it to the JBL flip 4, JBL charge 3, and JBL charge 4, and yes, it is more powerful than the flip 4, but not as much as the other two. Its battery is average, it lasts 2 hours at maximum volume, which is considered poor compared to the charge 3 and charge 4, but for this price, it's fine.
I have upgraded its woofers with 2 JBL charge 3 Woofers, which are clearly superior to its own and provide much better performance in both bass and treble.
Overall, this speaker is worth the money it asks for, for someone who doesn't want to spend more than 50 euros, but if someone can afford to spend more, JBL is the way to go.
I hope I helped.

Update 29/10/22: I decided to buy another identical speaker, and it was the best purchase. When they both play together, they enter stereo mode, and the bass and volume are like the JBL Xtreme 2, and for the 70 euros that both of them cost, it's the perfect purchase!

Update 25/11/22: I did a range test with these two speakers, and they could be heard over 200+ meters with such volume. You can't find that with JBL.