Well they are certainly economical with the truth....my 2Meg connection was rated at 520Kb/s downstream.
Adsl Guide gave 1900Kb/s which is pretty good.
Think I'll trust ADSL Guide,lol.
Interestingly.....a 375% increase would give about the same speed as ADSL Guide.Now me being cynical would suggest they scale the result down so they can meet their "guaranteed" speed increase!!!!