OK IT wasn't my bike, but first hand, watched a bro go down in a corner, at about 55mph. GSXR1000 03', doesn't have a scratch on it. I was amazed, he is using "Flame Sliders", you know the ones that light internally which look pretty cool BTW. They held up very well and certainly prevented a lot of damage. BUT your results may vary. I believe the general opinion is that they will certainly save your plastics in a little tip over or at parking lot speeds but beyond that a certain amount of luck comes into play. Talk to Cookie or Twisted actually. I think Twist has some pretty good experiance with them.
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