Double bathroom vanities are doubly functional, especially for multiple bathroom users. For married couple, it is great not to argue about which one gets to use the sink first, why the wife takes too long or how the husband often leaves shaving cream rings all over. Double bathroom vanities also increase the value of your home, just in case you would want to sell it or rent it out in the future. And lastly, they just look a lot better than the single sink units. There is just something about a double bathroom vanity that screams high class.