By the way, the only cable I needed to re route on my 2010 GSA was the throttle cable which as Bendy Toy says was a 5 minute job Re routing under the bars instead of over, plenty of slack in everything else
They do reduce vibes but not if laid back as you might with up/back risers.
The engine vibrates horizontally so the risers have to be set vertical or thereabouts to have any useful effect.