I have the Nissan side steps and only purchased them because they were functional. Many side steps that don't have a gap, don't allow enough room to get your foot in there. Also with no gap, people will try to force their shoe in there scuffing up your rocker panel paint.
I had an Xterra and the gap between the rocker panel and the side step was to small for my foot so I never used it. Since I couldn't get my foot into it, the side step was great for mudding my pant leg.
Just thought you should know before you buy something.
Have a good one.