Unishippers / Poor service
I too used to use Unishippers and had many of the same issues that are written about here, extra charges billed higher than the quoted amount and freight claims not paid because if you read the disclaimer it says freight is insured for much less than the industry standard of $20.00 per lb. that's why their rates are low.
I switched to TransLogistics Transportation a medium sized broker based in San Diego, CA. These guys really know their stuff when it comes to freight transport.
They have comparable rates with full coverage insurance and are a very friendly customer driven company.