I agree that they tend to detract from the look of the vehicle, however...
I have put them on all my vehicles to protect the lower sides from gravel,
salt and all the cr@p they put on our Ontario roads in the winter.
I WILL be putting them on my Overland, even though it looks better without them.
The KEY thing is - to get them 100% straight (level) when installing.
I always remove the tires to aid the install, and don't rely on eye-balling it.
I use a level just to make sure. Nothing worse than standing back and finding out that one of them is cock-eyed.