The top fur coat is left intact, but the undercoat comes out real easy. You have to use the brush very lightly - don't push it in or mistreat the cat in any way. Just put the brush on the fur, and stroke in direction that the fur grows. Tons of loose fur comes up rightaway.
I just brushed Samantha on the back and even more fur came loose. She's a furmachine.
As you may be able to see from the picture I posted the fur that came out is greyish/softish typical to the undercoat. Her brighter orange/brown coloured topcoat is left intact.
I already had a brush and I thought that one was fine. I'd brush her with it and a bit of hair would come out that would cover the comb and I was like oh that's alot of fur. A few loads of that and I thought that was it pretty much. But I've used this thing and I'm just blown away by the result.
It's getting hot here nowadays and I'd like to see Samantha stop hairballing and not sweating her ass off over something as silly as dead fur sticking around in her coat. This thing is the best solution to this problem that I have come across.
That and my roomba which vacuums my house every day when I'm not around. Except..well.. right now I've disabled it because I'm working on putting my new kitchen in and the place is a mess right now.