I avoid them. Not so much about the money but usually because where a toll road exists near a city, is where the local rush hour people are and it seems like rush hour is now 24 hour.
EZ Pass's is only as good as the state you are in. I hear you can now buy them in stores for the states you are in but what a pain it would be trying to find a store that has them.
The few times I did use them in Wisconsin and Florida? What a joke some charge by axle some charge by tires and some even add the tires and axles. My MH towing I never knew what the charge was going to be.
And honestly the 'main' reason I don't use the toll roads......I couldn't stand knowing that the dogs were all going to start barking at each and every toll booth and then would have to have a potty break right after.