I know this is an old thread, but I ran SSO sliders with kickout on my 470. Some thoughts/observations:
1. I did really like the kick out. I had never run sliders with a kick out before. The SSO sliders kicked out several inches wider than my tires. If they bumped a tree, that was my feeler to know to back up and try a wider track rather than let it "bounce" me around the tree like some have indicated. I'll reiterate that the kick out also made a good step for accessing the roof.
2. I did weld on (at the time it was their only option). I would not recommend weld on sliders. They were a PIA to get installed and despite 5x coats of paint, the welds started to rust within a few months.
3. Aside from the kick out, the rest of the slider held close to the body line, which looked nice, but was not usable as a step for front passengers. My wife needed that step. If you need something with a usable step, I would look at a much wider design like Slee.
4. Overall the quality of the SSO sliders was great. Welds were nice. I did have a gripe that the sliders weren't assembled perfectly flat. One side tilted up slightly toward the body and the other tilted down slightly toward the ground. It was very obvious when the sliders sat next to each other on the ground, but became less obvious when they were installed (mine were way before the scamdemic, so no excuses about labor/materials/etc. from that).