^^^I'm pretty sure with a 600cc+ bike, that second video wouldn't have been nearly as sketchy. I've done some insane emergency stops on my FZ1, which I don't think can be duplicated on a 250 (with the brakes, suspension, and tires it comes with).
I've heard the power equates to around a 250hp car, which is adequate, however it's the other essentials (like brakes and suspension) that would push me towards a 600cc.
For commuting around town, a 250 is a great cheap mode of transportation. However, if you plan to go for rides on a curvy country road, the 250 will get old really fast!