I have had the X15 Earbuds a couple days and wanted to wait before posting a review.I like the fact that they came fully charged.I liked that they paired with my iPhone with out any problem whatsoever.I loved that straight out of the box they fit in my ear very comfortably and firm. The cups that came already attached to the earbuds were just the right size/fit. With other earbud sets I had to swap out the different cup adapters to try and get the right fit. However even after doing so I found myself having to push the earbuds back in to keep them from coming loose and falling out. Each time I pushed them back in one set would turn themselves off. Another set would disconnect from the other ear bud.From the first use of the X15 Earbuds they have stayed snug in my ear and I have not had to push them back in.Definitely the best fitting set I have used hands down.Another pleasant surprise was the documentation/booklet. It provided more detail than all the other units I have used. That was nice.The Charging Cable along with the Charging readout was straight forward.All and all a very nice set.