Both times I had zero damage to the bike thanks to the sliders.
I assume, you never checked the (geometry of the) frame, right?
In the 90's, on ZZR's, a single bolt, b/c of the washer staying about 1cm out of the fairings, had chrashed a lot of frames:
(The big washer, just under the top fairing)
Because in a simple pushover, the bike did fall on this bolt and dented the frame. Only visible after someone took off the fairings. But assumable, with checking the gap, between fairing and frame, on both sides.
All the big bikes have, unlike the 250's, aluminum frames.
In my eyes, frame sliders are frame killers. Minimum for aluminium frames.
But still with a steel frame the impact power is centered on the part of the frame, where the slider is connected.
I'm not even thinking on a high(er) speed slide and the slider working as a hook or a catapult.
Aside, the fairings is so cheap, the sliders look so .....
Yep, I would say : Avoid them.
For sure on a bike with aluminium frame!