As for Harry Potter, they would totally test out the latest Nimbus and see how it compares to the Firebolt, and then there'd be some sort of low-price broom contest where there are all sorts of disasters. Possibly one broom is on fire.

...I wish you'd stop making me want to write things like this. You're a terrible influence.

(But that would be amazing. And Jeremy on a broom would race Richard and James on flying carpet to Tokyo, and Richard would fall off over Russia and James would have to rescue him and while they're doing that Jeremy would make up the time he lost when the tail caught fire and he had to make an emergency landing, and it would be incredible.)