I've tested the R&G ones, several times, they work :-)
I've also tested some cheaper ones, they looked nice, but bent / broke off on first exposure to tarmac.
On a track bike they're a no brainer, on a road bike they can save a lot of damage if dropped, but there is also a chance, if the sliding bike hits something like a shallow curb or drain hole cover, that the slider "digs in" and could in theory cause damage to the frame.
If you're going to get some, get good ones - R&G, and I've heard that the Evotech ones are good but have no personal experience.
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