Definately hoob helps. How effective ? Well, it depends on a few factors :
1. The power of the hood, funnel is usually higher in power thus more effective but it does not look so nice. (maybe its my personal preference).
2. The distance between the Hoob and the hob, of course nearer is better, I suggest about 60 to 65cm.
3. Maintnance, the best hoob in the world will be useless unless you clean it regularly.