Accurate they are hitting the API and it should yield the same results as say a worldship. However there are discretionary charges that drivers or UPS themselves can apply at time of delivery. Example we have had clearly businesses, but rural business categorized as residential because they are far outside the route. Charges like that, that UPS seemingly employ on a whim really start to create the disparity. If you get the same result from worldship, online, and manifest/quickship on a consistent basis there is nothing wrong with manifest and you should press your UPS rep. They will always blame integration first.