Installed Dual Stars a month ago on my 99 B12. They DO provide more heating on the left bar to balance the insulating properties on the right. There was no added insulation needed and they run well in 45° weather on LOW. Now building a heat troller since HIGH is useless and I will have a jacket one day. Those dual output trollers cost some $$ considering it costs about $15 to make one.
I've used Supergrips gel grips from Dale for years and like the vibration absorption.
I have always run a bar full of standard BBs. Currently running Dale's bar in the post crash machine and BBs get added today. No news on vibration there but they worked great on the original bar. Dale's bar ends are lighter than the originals so we'll see.
Marc/Atlanta