These are honestly a great product and I've experienced minimal issue with them. I use the glasses daily on the construction site for audio books, podcasts, and music. The only complaint I have with audio is that the speakers can distort at maximum volume, hence the 4 stars. I also experienced a strange charging issue that woulds turn the glasses off, even when the battery still had a charge, until I connected them to a charger. Customer service was helpful in explaining the issue and offering a replacement pair if I couldn't not resolve the problem. They walked me through reset steps and I was able to remedy the issue. I'm about to purchase my second pair as the first have taken a beating and the lenses are starting to get scratched up. I work in commercial construction and they have stood up well to the abuse.