I used it on my OverRACING Handlebar with an Active Rubber Bush and it has some weight to it and reduces vibration. I'm very happy with the look of it and it was a good decision not to go for the short version.
Please note that the spec. is to be fixed with 3 cap bolts. It has a load capacity of 3kg, but I don't think you should put a top case on it. It has many hooks, so it is best for small and light luggage. It is better to think of it as an extra .... The paint quality is okay with powder coating, but the welding is rough.