The belt is, as already described by others here, very convenient and easy extensibility pleasant relief - especially if you travel a lot and has the camera hanging on the shoulder. Furthermore, it is very flexible (Neoprene another, I had, was not so easy to fold, to carry the camera in your pocket) and unobtrusive.
Actually, I'd love to be awarded 4.5 stars because it smells a little rubber. But I think that is over time and it really is not disturbing.
Overall, a strong buy recommendation to all those who are annoyed by the standard strap of her camera - this makes a lot here really know what the others are doing wrong.