I installed a pair of SW "step" sliders today. They're beefy as hell and stick out quite a bit (In a good way). They bolt up nice and snug. They look almost fluch to the body looking down at them, but they maintain a small gap from the body panel. The powder coating is very nice and showed up via UPS in CA without a scratch. The packaging is this state of the art expanding spray foam inside plastic bags inside the cardboard box. It was cool and it kept the sliders nice and safe. I'm very happy with the overall quality of these things. In terms of off-road functionality, contrary to other designs, this entire slider provides the "bump out" effect. It will keep you plenty far away from rocks, etc. and give you a safe pivot point to avoid damage.
When I mounted up the passenger side, there was about a 1/2"-3/4" gap between the passenger side front lower mounting bracket and the frame cross member. With both top bolts tightened down, I used the bottle jack and pushed both corners of the bottom bracket to snug it up to the frame. I still ended up with about an 1/16" gap. I used a couple of the extra washers to make a spacer and this allowed me to tighten things down with a straight fit. This is where the 3/8" hole is drilled into the frame cross member (DONT FORGET EYE PROTECTION!). I'm glad I have the extra strength up front. I only drilled the one hole overall.
For a majority of the mounting positions, it's required that you fish a locking stick-nut through the small openings in the frame to find the bolt. The stick-nuts provided do work very good for this. I found it somewhat peculiar that the steel flat bar from the stick-nuts stays attached. These pieces seem like they could rust easily. I've more recently heard of others painting these stick-nuts before install (I did not). No biggie.
So far, I'm impressed with the quality, the apparent toughness, and the fit of these (for the most part). If you're like me and want to give the kids some help getting into the T4R and want a good step for accessing the roof rack, all while giving you top notch trail protection, these are about as good as it gets.