512Kb/s was the old limit for anyone that was more than about 4KM from the Exchange.
With RADSL (The new noise limits BT adhere to) that would likely go up to around 1.5 - 2Mb/s..
I get 1.5Mb/s where as previously I could only get 512Kb/s and before that I was classed as a failed install as SNR was too high