It may seem like the mouse goes with the keyboard, but the mouse was actually released in January of 2020. The keyboard is very much its own separate thing, and it looks to me like they paid way more attention to its features and overall quality. I have the Fami Edition of the keyboard and I love it. The keycaps feel premium, and the Kailh Box V2 White switches strike a nice balance between smooth typing and tactile feedback. I used a keyboard with the excellent Cherry MX Red switches before this, and I find that I prefer the Kailh switches.
The big buttons were the wrong shape for the OG controller and not shallow like the arcade buttons on the NES advantage, but the keyboard looks pretty sweet.