Best toll transponder for Texas east.

The company that I work for just went to BestPass last year. Obviously, it's theirs, not mine, so I don't know much about it except what they told us when they got it and why its better.
BestPass is supposedly contracted with many (think they told us all) toll services and it covers all the toll companies. So as I understand it, we contract with BestPass & they set us up on their contract with all the toll services in which they are contracted with. They pay the tolls and we pay BestPass in one bill. I don't know, its just the way I understand it.
Personally, I just run 5 deep south states... TX, LA, Ark, MS and AL. But I know the company runs the lower 48. I am assuming they run these BestPass transponders throughout the fleet.
They also work on scale houses etc like @Dna Mach said.
As far as a driver, its been helpful and I havent had any issues with it. Works for me.