I have been arranging freight for my company for 7 years now and ATS is outstanding. I primarily use them for truckload shipments as I deal directly carriers with unbeatable prices on the LTL side of things. Even then, ATS LTL rates are pretty close to what I get directly with carriers.
I can send ATS truckload a request for quotation and they reply back in minutes, sometimes seconds. I don't know how they do it so quickly and their rates are consistently great. I don't even check other places anymore. ATS is always the best. Then once I ask them to arrange a shipment, they send over the BOL and update me constantly on where the shipment is. Can't recommend this place enough for truckload shipments and for LTL if you can't get rates directly with carriers.