Step hull question
 

Me and my buddy were talking yesterday about a boat that he is looking at it is a powerquest 28 silencer. This is a single engine single stepped hull from powerquest. He says that he was talking to a salesman that used to sell powerquest and the salesman told him that the single step on that boat is useless and that there is no performance gains on any single stepped boats at speeds less than 70.
Has anyone heard anything in support of this or not?
Thanks guys