I use it (39 degree, black colour version) on my 729 Friendship Blue ALC blade.
First of all...strange sound when contacting the ball. Does not matter to me that much, but I've never heard a sound like that. Suprisingly, lot of control even with faster FH topspins. For me, someone whose FH is far weaker than backhand and I am learning proper strokes again, it is a really good rubber. You can feel that when you do slower, more loopy strokes, ball is really spinny and drops really fast but when you do a faster stroke for more speed.....well, I can't complain for speed. It IS fast when you do a proper stroke technique. Also, tacky. Out of the package, I managed to get the ball stuck to the rubber for couple seconds before it fell.
Good for blocking for both FH and BH but you need to correct your racket angle since it WILL bounce fast if you block a fast topspin.
Not to mention price-wise, it is really cheap. 55 PLN on Aliexpress for me, so about....15 dollars ? Already bought two sheets in 39 degrees and will probably buy one more to test on my 729 Friendship Yellow ALC blade.
Also, did not boost it. For someone like me, who prefers more controlled offense and topspins, speed I can get with this rubber is more than satisfactory. My friend, who has a far better technique, gave it couple strokes and was positively suprised at the performance. He said it was more spinny but slightly slower than Tenergy 05 which he usually uses.