So far I've seen a YouTube video of a guy running them and a guy or two on Instagram running them. No personal experience but I'll say you're likely to get a lot of naysayers on them, especially from guys that don't understand transfer of load.
I'd say if you're planning to hit some serious off road trips, a lot of more advanced rock crawling with steep drops and risk, then frame mounted is the only way to go. If you're looking for something more for incidental bumps, scrapes and slips, they should be more than fine to protect against dents, dings and punctures. That said, the mount involves something like 30 rivots into the rocker and inside door jam rocker panels, so they are basically a permanent addition unless you're planning on replacing rockers.
The main plus I see for them is they allow you protection while still running amp steps, and they look sleek.