The spray all depends on tire width snd wheel offset. Mine still sprays the rockers but thats because i dont have mudflaps. If your tires don't stick out too far it definately helps with the spray on the doors and hood.
Had them on my 2011 with a 7.5" Rcx lift with 22's and 35's with a neg 24 offset. They definitely help me out. I used to get mud all the time on the roof without them and then put the bushwackers on and it cut the spray down considerably. Not completely but a lot