I had the original pump air earbuds and was impressed with their compact size, comfort and sound for the price. However the battery life declined dramatically after a year of use. I decided to buy the pump air X buds hoping for the same comfort but with improved battery performance. Unfortunately these are bulkier and quite uncomfortable after about 15 minutes of use. They also stopped transmitting sound after a few months so I returned them for a refund. PROS: Decent battery life Good sound quailty CONS: Bulky and uncomfortable Buttons are difficult to press Stopped transmitting sound after first few months