I love UShip and tell people about it all the time. No one knows about the site!!
This past shipment was the first time I had issues. Booked a provider and he bombed out on me 2 days before pickup and I had booked an airline ticket which then I lost money on. I did find another guy but I was not expecting that. But the second provider was great!!
Your web site could use a few tweaks. It is not easily navigated and I use sites ALL the time. If one answers a question but then has something to add there is no way to do that. Then someone answered me via a question and it still shows up as though I have an unanswered question, when he just replied a 'Thanks'. So, it needs a bit of work.