These devices do create a bit of controversy. I read about them years ago and from what I saw they looked good, particularly for long journeys. I bought one and after half a day of using it I threw it away before it killed me. In any kind of traffic where braking and accelerating were involved I found my hand accidentally touching it on occasion which made me go faster when I really wanted to slow down. I would never use one again but I do realise that other riders may like them.
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