I hope this review is helpful. There really isn?t a break in period - they?re good to go out of the box. Smaller then the picture. The battery felt just as robust as the day I began their daily use well over a year before I lost them. I bought a size 8. I like my clothes fitting tight but this was WAY too tight. Sehr stabil, sehr schnell aufgebaut, komfortabel in der Bedienung. Excellent product as expected. The software it comes with is also very useful. These are supposed to be they same ones just with the iPhone connection.