I initially had a technical issue where a coupon code wasn't working. That was compounded by a user error on my end where I accidentally bought two headsets at full price. A Koar representative quickly responded to the error and refunded the amount to what the price should have been for the headsets. Great customer support experience.
The Headphones themselves work pretty good as well. It's my first experience with wireless headphones and they do get crackly every now and then, but overall I think they are a solid product.