Yes, it is noticable. Even adjusting the camber is noticable. If you want a real noticable drop, you need the full race coilovers (15,000 cr.). Buy it, install it, and camber and slam it to the max. I'm sure you'll notice the difference.
I was curious about this too so I tuned the suspension on my SLS so the front ride height was -25 and the back was +40. You can really notice the difference with that.