Right, cubing scales up much more readily than juggling. Although I've found the bigger cubes aren't quite so impressive because you can't do them as fast. I take 10-15 minutes for the 5x5x5, and by then any observer has lost interest.

But yeah, some people will be impressed just because it's bigger. They always say that it must be super hard. My stock reply: "It's like a jigsaw puzzle. Is 1000 piece harder than 500? Not really harder, it's just more of the same thing." Sometimes that gets a blank look, sometimes that induces enlightenment.

My favorite cuboid variant is a 3x3x4. That blows people's minds when they see it's not symmetric, and they handle it and realize that it can't do certain turns (the long axes have to be 180° not 90°), but in fact that limitation makes it easier and I can solve it almost as fast as a 3x3x3.