Upgrading to a mesh network can improve wireless coverage in your home, allow for faster speeds on devices that sit further away from your router and eliminating dead spots in remote corners. This is especially true if there are several obstructions (walls, doors, and so forth) in your home that sit between your wireless device and router.

Source: Hot Hardware – ASUS AiMesh Enables Some Existing Wi-Fi Routers To Create A Mesh Network For Better Coverage