Has any one used the "Zrate Instant Freight Quote App"

Hi. I'm looking for some feedback for the rates given from http://www.zrate.com/
I have just discovered this App that quotes freight loads in a moment.
They say it can run a quote from 1lb to Oversize and Overweight loads instantly with what they call 100% Accurate Escort and Permit Information.

They seam to be pretty much spot on with the quote for my load, and it only took moments to generate rather than all afternoon.
Also seeing if anybody has had a bad experience dealing with them. I looked online and can't find any complaints.
I will be trying them out more in the future for getting a load quoted.