Yamaha Reface DX

If you want to edit/create your own sounds, be warned that the controls are extremely obtuse and difficult to use accurately—at some points downright frustrating to work with. The stock sounds a so-so with a few highlights inbetween so you'll probably eventually want to create your own sounds... The FM synth engine offers a lot of opportunities if you ever manage to get past the crappy controls and succeed in inputting your desired parameters.

Apart from the exceedingly poor controls, this is a super enjoyable mini-keyboard. It's robust, heavy and feels like a solid piece of hardware, but time will tell if it actually lasts or if they just filled it with heavy materials to make it seem sturdy. So when you get to just play it without having to interact too much with the controls it's an absolute joy of a keyboard.