saw a friend lay his bike down on a country road at about 35-40mph low sided... the bike slid down the road and dug a gouge in the road almost 3/4in deep. it was sick..... sliders were fine just some dings on the end.
derlin tipped sliders are safer.
The best sliders I've seen so far are made by freestyle inginuity. The most common ones you see are made by shogun or vortex. I have not had a good expirience with vortex, both bolts broke, but the shoguns did good in occasional drops..
shogun makes a good slider, used by las vegas extremes, and many other stunters.
But call shogun, because some of their sliders are for looks only, for example, on the 99'-02' zx6r they bolt into a fairing bolt, and they will just break the little bolt when it falls, on my zx6r it did more damage with the sliders than without, because when the bolt broke, the slider stuck in the recessed hole in the fairing, so it ripped most of the fairing off, instead of just sliding, and rashing the fairing.
now on my gsxr 1000, the frame sliders held up great, went down at the track, at about 25-30mph, and little damage to the bike, vash can testify to the damage.