Actually have the wall mount version, but I'm happy with it.  The fan is loud at the highest speed, but it's very effective at getting rid of the smoke, so I'm not complaining.  The direction say you can put it anywhere between 24 and 36 inches above the range.  I have it at 27 and it works fine.  Would not recommend putting it much higher myself.  Vents are very easy to remove for cleaning. Overall, good product.