A leverless controller is supposed to eliminate sluggish joystick movements. Sometimes, it has only buttons or a mixture of buttons and keys.
The Mavercade Lightweight is the Floyd Mayweather of controllers: its low profile buttons allow you to pull off combos at lightning speed!
JumpHack is one of Japan's finest sources of highly customizable controllers, such as the JumpHack11-XL (also known as the JH11XL).
The Jabslab Digital Combat Controller is a mini LED controller with customizable artwork and other included goodies.
The Studio is so customizable that—in addition to its layout—you can pick the colors of its buttons' rims.
3D printers can make the mini Flatbox controller at home or simply order it preassembled for maximal convenience.
The Zero Two is a modular controller that can be ordered in lever or leverless format—as well as preassembled or DIY form.
The Zero One is available in multiple layouts and colors—plus preassembled or DIY formats—and an overall modular design.
The RAC-J800B, part of the J800 series, is an excellent all-button controller that is available in multiple variations.