Yeah, they look really nice, but they seem really expensive for what they are. They do look like they might offer more protection than the Givi version.
Yes, I have got the cheaper givi bars. Yes they work well. ....I think it was the 24 cans of lager in the top box which caused the instability (& my foot slipping on gravel).
Got them from Byke bitz in 2 days (about £110 including delivery).
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