I get that Boomerangs are rough (most of them, at least) but if you think the layout is great then why did you post it in the "Worst coaster layout" thread?
According to this link, Ring Racer is the world's fastest coaster and stole the title from Kingda Ka.
www.telegraph.co.uk/travel/picturegalleries/5819371/Top-10-Britains-fastest-roller-coasters.html?image=14