Firstly, this is a review is specifically aimed at the use of two speakers in stereo mode. This is the reason I bought these speakers. So if that's your interest, I've provided detail below. The overall sound quality goes up SIGNIFICANTLY when using two of these speakers in Stereo mode, in comparison with a single speaker. If you can afford two, then I'd say buy two, because two of them sound about 5x better than one.That said, as a standalone speaker it's a great speaker for the money, Anker proves itself over and over to be a cutting edge company that cares about making good products. I've purchased their goods for many years and I've never been disappointed. The sound quality of this speaker is excellent given it's price tag (for me $49.99 USD). I can't imagine anyone not being happy with it given the build quality and price and sound.For fun I compared the sound quality against my single $299 Bose Mini-SoundLink II speaker, and of course the Bose is much richer and cleaner, but considering the Soundcore Boost is 1/6th the price of the Bose, it performed absolutely outstanding!! So again, I would recommend the Soundcore highly.Battery life so far (owned them for a month), is very impressive. Nice work Anker!!!STEREO MODE FUNCTION: Key Points- Quite a few people in the reviews complain that the stereo mode function is unreliable, and some seem to think its terrible and claim it's very difficult to use. I'd agree that it *was* ... until I figured out how to use it properly, and then it's been pretty easy, ... so, more on this below for those that care.On the issue of stereo connectivity, one should first consider that it's a $100 set of speakers and this is relatively new technology, so perhaps expectations shouldn't be so high? One also needs to understand that the speakers will perform differently depending on the hardware they are interacting with, and various other factors, such as speaker placement. THEY WILL NOT PERFORM AS SUCCESSFULLY IN STEREO MODE WITH ALL INPUT DEVICES. MAKE SURE YOU UNDERSTAND THIS. Here are my detailed findings:- In my case, the speakers operate in stereo mode *almost* perfectly with my iPhone XR and my girlfriend's IMac Pro, but do not do so well with my Hewlett Packard PC running Windows 10, so I've given up trying to use the speakers with my PC. It's a bit disappointing, but again, what can I expect for $100 bucks?!- Note that the sound WILL drop out occasionally even on the Apple devices for maybe 0.2-0.5 seconds, which can be annoying, but it doesn't happen very often, and sometimes I can play music for many hours without a single issue. So for the price, I can easily deal with these minor disturbances. The problem seems to be worse when streaming online movies. They perform great with streaming Apple music.- Getting the speakers synced up with each other and connected in stereo mode with my device for the first time could be tricky and frustrating. On top of that Anker's instructions to set them up are PATHETICALLY bad (Come on Anker ... REALLY?), so it takes a bit of messing around to figure it out. It seems best to follow a specific sequence of events each time, if they are to connect reliably in stereo mode. It seems that the device connects to one of the speakers first, and then the second speaker connects to the first speaker to create stereo mode, so this creates a linear connection rather than a network type connection. One doesn't want to attempt to connect the device to both speakers if the intent is to use Stereo Mode. Therefore here's what I've found successful:1. (see photos provided) Label one of your speakers with a number 1 (using a sticker that you can see in the dark). Label the other number 2 (Or label them A & B, whatever, just some what that you can easily tell them apart). It's good to make the stickers in the shape of an arrow so it's easy to see which direction the sound comes out. Why Anker made these into homogeneous rectangular prisms is beyond me ... one shouldn't have to carefully examine a portable speaker every time they put it down to make sure it's facing the right way, and, it would be nice to be able to see the buttons in a dimly lit room, but they are very flat with very little texture (see photo).2. MAKE IT A POLICY TO CONNECT YOUR DEVICE ONLY TO SPEAKER 1. Do not allow your device to pair to Speaker 2 ever, and if you do create a pairing with Speaker 2 by accident, delete that connection from your device.3. Once labeled, power on ONLY Speaker 1 and pair it to your device.4. Once the device is paired to Speaker 1, then turn on Speaker 2. Then use some combination of the TWS buttons under the rubber connection protectors and the power buttons, to pair the speakers together in Stereo Mode. This can be tricky, and Anker's instructions don't make it very clear what order to do this so it works easily. I just kept pressing them in various ways until the two speakers paired. When they pair, a sound is emitted from both speakers. Then you're ready to go and if your lucky, you won't have to do this again!5. When you're done listening just touch either power button and both speakers will shut down, COOL!6. IMPORTANT: When you return to use your speakers another day, turn on Speaker 1 first and wait for the goofy sound. Then power on Speaker 2, and it will make the same goofy sound, then after a moment, both speakers should repeat the goofy sound together indicating they've auto-paired. You are then ready to play music from your paired device in stereo!7. To add another device, shut down Speaker 2, pair the 2nd device to Speaker 1, and it should work just like your first device.Since getting this process down, they've worked great. Why Anker didn't explain all this more clearly is nuts. They only provide a tiny leaflet with silly, difficult to interpret diagrams on them. Kitschy and cute maybe, but stupid. My only serious complaint. These speakers are great for the money and I recommend them highly ... just understand they have limitations.