The product works quite well. I filled up two small tires fairly quickly. It shows the existing tire pressure, which is very convenient. The device's sound is not quiet, but not too loud either. Works with rocking sound/movement. The most immediate and disappointing thing about the product is that it doesn't have the same skin as the one in the listing. Looks a lot cheaper and less sophisticated. Instead of a one-piece, smooth shell, it has a rough, two-piece shell with raised stitching between the shells. It's also a bit lighter than expected, but that's not necessarily a disadvantage.