I've been using these for a couple of months, and they are great quality for the price. The sound is fine, and the battery life is excellent. Each earbud lasts for 6 hours on a charge, and the case can recharge them enough times last a full day or two of regular use, especially if you swap out and listen to only one earbud at a time.
The main downside is that the touch controls on the earbuds are quite limited. You can play/pause, and skip forward, and that's about it. So I've had to get used to using my phone's volume keys to control the volume. But that minor inconvenience is worth it to me, considering how inexpensive these are.