This involves hiking up and down grass, dirt, shrubbery and cement hillsides. I routinely carry 2 bikes on this rack without much trouble. Great product all around with either single use allowed by both buds. That?s the only function that seems to be missing. The bar supports and safety bars slide into place with ease and feel very sturdy. On top of it, one of the "hooks" (that happens to be a tiny protruding piece of plastic) broke off easily as soon as I tried to insert the bars into the banks. The ear bud itself the piece that fits into the ear is a fat bubble type of shape that doesnt fit well in my ear. Online, I liked it because it did not require any drilling into walls and could be set up pretty much anywhere. Lo que más nos ha gustado es que a pesar de que aprieta no es incómoda y no hace daño. I use this primarily for sleeping and have another great for awake listening that has 40 hours of listening time.