My new 2018 sides and rear were constantly blasted buy mud and debris when wet (it's always wet here). I added flaps a couple weeks ago. Just a note that the 2018 mud flaps install exactly like the previous generation. You can re-use the 4th lower screw on the lower/inner rear flap just like the previous generation (2015.5 anyway) without drilling. For the others, use the screws that come with the flaps since those screws/bolts are a little longer.
The 2018 mud front and rear flaps protrude horizontally slightly more than the previous generation so they do the job a little better. Less than 5 minutes per flap to install.
2018 on the left.