Allow me to start by saying that this is probably a really good rubber... for professionals. But for amateurs I think most of us are not good enough to take advantage of it. I wanted to see what the hype was about, so I bought a sheet of this rubber (for way too much money) and was not so impressed by the outcome. I've tried several other hybrid rubbers which feel better than this one, including: Tenergy 05 Hard, Rasanter C53, and Tibhar Hybrid K3. Even Dignics 05 feels better to me, and I mainly use Chinese rubbers.
I personally cannot get over how high the throw angle is. It makes it very hard to loop the ball from behind/under the table, which is where I hit a lot of shots. I suppose the high throw angle can be nice when flicking an underspin ball close to the table, but let's be realistic -- no one under a 2000 USATT rating does this in a way that would be benefitted by D09c. Fan Zhendong probably gets some benefit, though.
The sponge hardness is nice, and it allows you to play some very fast shots if you put in the effort. But you have to add some spin -- flat hitting is somewhat unpredictable.
Dignics 09c is very sensitive to incoming spin, so you need to be very precise with how you hit the ball.
D09c generates a lot of spin in a very short stroke. Usually (with Chinese rubbers for example) you need a bigger stroke to generate a sufficient amount of spin. But the high-end of spin with D09c is still less than Chinese rubbers. Same with high-end speed.
Unlike other hybrid rubbers (mentioned above), Dignics 09c is very heavy. Some people might like this but I think most will not. If you want a lighter rubber, K3 and Rasanter C53 are better options.
All in all, I cannot find too many faults with this rubber. It's a great rubber and lots of people use it for a reason. Personally I REALLY dislike the throw angle, and I think there are better options out there for less money. So I will give it 3 stars.