La única cosa negativa es que si no se tiene canastilla, se tiene que amarrar por dentro del carro y si llueve, entra algo de agua entre los empaques que aplasta el sujetador del portaequipaje. And as far as the battery life its amazing, on one charge I can get 11 to 12 hours. Look maybe its just my feet but I get better comfort with 5. ?? PRINCIPALES PUNTOS POSITIVOS:? Bluetooth 5. My vet uses this. Picture of the bottom of the shoe included to show the very little wear to the bottom. I did the sound tests available on YouTube to test the dynamic range and frequency response. So far, not a a fan. The bluetooth range is better than the others I have. Great comb, be sure to keep it cleaned and well oiled.