I have actually owned several of these little fellas, and they have worked well. I got my first Mini H20 in 2016 for black Friday and it was still kicking when I last saw it (it disappeared). UPDATE: Found it: it STILL kickin'!! The red unit posted is that model: keep in mind it's looking like that after nearly 4 years of far-from-plush life. The teal one is the one I bought from Amazon.So here are my experiences throughout the 3+ years or so I was able to use these speakers:First, the sound quality is very good considering the speaker is so small. It's powerful enough to be heard over shower water and good detail could be heard too. It's very clear even at it's higher volumes, probably the clearest sounding speaker of it's size I ever heard. Adequate bass for the size too. I purchased a Baby Boom from Altec Lansing the year after and it actually didn't sound as good as the H20 Mini that I originally got (it seemed to focus more on bass and sounded duller and more easily distorted as a result).The speaker could go about 10-16 feet before interference would usually start to occur for me. I don't have very many open or uncluttered spaces available to me, though, so your distance may be greater if you do.The battery life was around 5 hours or so on average for me. I typically played it at about 60%-70% volume if I didn't have to worry about disturbing or waking anyone. There were many times I left it on on accident with no music, and in those cases it would still play even if it was more than 5 hours.I threw this speaker in my backpack or tote most, and they got thrown around a lot with a bunch of other items. After some time, the grill on the front of the speaker ended up bending and somehow got punched through. The speaker kept playing anyway. After more time, the grill came off entirely.The rubber/silicone material on the outside got looser and looser with time. It never quite came off, but I could definitely see the black plastic of the device on the sides, where it wasn't even clinging anymore. I'm sure if it were desired, I could have pulled that off entirely as well.The speaker was dropped, put in countless showers, put in sand, and I even clipped it to my belt loop once and then rode my motorcycle at speed with it. It never stopped working, and the battery was always able to charge consistently.My little sister got a grey one of these in 2017. She hasn't put it through nearly as much as abuse; it still works in addition to looking fresh and pristine.At the time of this typing, I hadn't been able to pair 2 of these speakers together because I never had two of the same generation to use at the same time.Overall, if you can find these discounted, I think they are a great buy that's worth the money. These are robust little speakers that play better and louder than your typical smartphone speaker (better than anything for $20 for that matter) and will even save your phone's battery power since you can avoid using its onboard speaker. I highly recommend it and will even be giving one as a gift this year for the holidays.Hope this review was helpful!