How Good Is STS [Specialized Transport Service]? They're Advertising Dedicated with Guaranteed Pay.

It's me again.

I saw an advert for STS advertising a dedicated account with guaranteed pay. I'm about to apply for it, but want to get anyone's thoughts on it. How good of a company are they? If they make a promise, do they keep it? I need to get some kind of work going on soon, but I'm a little bit cautious after being left stranded hundreds of miles from home and even losing my home because of how much that cost me. I'm absolutely not going to drive for mileage pay without a minimum guarantee.

Thanks in advance.