Originally posted by Balfa
all these superbroadband speeds are just a potential limit. the companies can advertise these speeds because, theoretically, that's what they do. But actually achieving these speeds while there are other people in the neighbourhood using the service is virtually impossible
My point being: it depends on your ISP/cable company, and how they set things up. So although you're correct in many cases, not every provider oversells to the extent where you notice a slowdown in speed.
Using ADSL in Germany for example, no matter what time of day or week I tried, I never noticed the speed varying -- always a solid 90-100K/sec.