This description by hayasa is a more detailed review of the issue. This forum has very limited participation and depth of information compared to other forums which discuss JGC diesel issues.DO IT! Right now there are 4 levels of protection on the vehicles:
Nothin' - Common on the first batch 2014s. Basically a matter of time before the DEF injector or hanging lines are ripped of by a deep puddle. (You will be stranded, blamed by the dealer for abusing the vehicle, and will likely be financially responsible for the repair.)
Stage 1 - Common on later 2014s and early 2015s. Jeep basically zip-tied (at factory or TSB) the lines closer to the frame, but injector is still exposed.
Stage 2 - Current 2015s coming off the line. Jeep's "shield" basically wraps a bracket around the lines, protecting them from being snagged. Nice try, but the injector is still exposed. Will fix 90% of the problem IMHO.
Stage 3 - The infamous "Dom's Plate" aftermarket upgrade. Both lines and injector are protected.