I was hesitant at first. My last pair of Jaybirds (X3) suffered a battery fault which had pretty much resulted in a complete loss of faith in the brand. After some research online, I built up some courage and made the purchase. Since then, I have been nothing short of impressed with their performance. The first charge lasted about 8 workouts of between 45 mins –2 hours of training. The clarity is excellent, and the signal between phone and headphones vastly superior to previous models. I wouldn't hesitate for a moment to buy these again.