depends on coverage and your supplier and the amount of users at any one time. I'm using one right now with a potential 7.2mbps but achieving 2.5 right now
As said, depends on coverage. When the blue light is on mine it is fairly quick, but when the green light is on it is slow and no good for streaming videos &c. I get a much poorer reception downstairs than upstairs. I've just noticed that the light has turned green, so it may be a while before you read this - hang on it's just gone blue again.