Can be a pig to fit if they come with urethane bushes. But they definitely stop roll if you're not fully loaded.
I fitted mine at Techenders with @paulcalf help. It was not too bad with urethane bushes, just need a pair of grips to get the clips in a close-ish position, then using two pairs mole grips keep tightening in turn until you can get the clip on. Then do the other side. Makes a massive difference in handling. Just one note: if your bus is lowered, the heavy duty bar has less of a bend in it than the standard one so will hang lower and you may possibly twang it on speed bumps etc.
