Depends what time.
Should be OK (ish) after about 7
Toll road is usually quiet (at least that's what the advertising boards say!) but costs �7 (I think) for a car.
I usually use M6, and generally don't have any problems - just don't go anywhere near it at rush hour.
Have had recent rotten experience - pay the toll, on the way back sat nav said no I went on the crappest time and petrol consuming convoluted route, due to travel improvements!
Pay ,pay, pay!