Regarding YY video, I won't translate everything but here is a TLDR
YY says he never liked tacky rubbers like Chinese rubbers or SpinArt because you need to use a bit more body, and its more difficult to adjust when you're a bit late on the ball. He is also always afraid with this kind of rubber that the drive doesn't make it past the net when he's a bit back from the table. But he says all these worries don't exist with D09C. He is very excited and will adopt the rubber for both sides.
He says the main weakness is on flat hits where you need more action, and the ball tends to go down to the net (low arc ?). He is impressed with the ball quality (speed / spin) and says its very easy to drive FH. BH topspin at the table is very easy as well. BH a little back from the table needs a bit more technique than with a non-tacky rubber, because you need body, just swinging with the arm is not enough. Its very effective though
for the record, Yuichi YOKOHAMA is a former quarter-finalist at the National Championships