Like I assume many others have, I looked at this product as a cheaper alternative to the Apple AirPods. To be entirely honest, I was expecting mediocre sound quality and battery life. I turned out to be delightfully surprised by how much I like these earphones.
The sound quality is very clear, perhaps not "audiophile" tier, but let's be honest: no earphones are audiophile quality at $30. I've heard people complain about latency when watching videos. I personally haven't experienced that. Whenever I watch a YouTube video, I don't notice any latency, though I suppose that I could be not as sensitive to that as other people. The battery life is also pretty decent (not mind-blowing, but solid). The Bluetooth is easy to set up as per the included instruction booklet; pairing them with my iPhone 6s was a cinch.
They are comfortable to wear. I'm usually not a fan of the squishy rubber found in a lot of earphones—I usually wear over-the-ear headphones or hard plastic ones—but for some reason, I think these earphones are comfortable. Differently sized rubber pieces are included, in case you prefer a larger or smaller size.
The only gripe I have with this product is that no charging cable was included. I mean, Micro USB cords are ubiquitous enough, so it's not egregious.