Ok, There's the review:
First of all, thanks to fais and carl who have helped me during the boosting process. Dayum my rubber now smells very nice :3
I was a noob when I bought this rubber along 2 years ago. I bought it along with my DHS PG7 (clipper clone, 7 ply, composition=dhs 506) directly from China. I did my research and fount out that the softer the sponge, the easier to spin. And my friend said chinese rubber demands good technique, so if you use chinese rubber, you will acquire the perfect chinese technique. Considering all of that, I bought neo H3 province 38 degree.., and when I tell my friend he laughed, he said you need hard sponge for chinese rubber, 39/40 would be perfect. Now I understand why...
TL;DR : The rubber boosted was 2 yearold H3 neo Province 38 degree, the condition is decent, still can produce deadly amount of spin. Tackiness is still there but not that tacky anymore.
Boosted 2 layers, and I put it on my new Viscaria, so I cant do head-to-head review.
Spin: the topsheet can produce really spinny shot, like holy cow spinny!!! I can see that my shot lands on the table more (which probably will go out using my pg7+unboosted h3) due to the high amount of spin helping the ball to curve down.
Speed: Definitely faster (viscaria helps this too) but this comes with double edge. I think 38 degree is too soft to be boosted. Doing forehand spin using my unboosted H3, I can really feel the ball goes in penetrating the sponge, while the tackiness holding the ball, and with front-upward motion lifting the ball and producing the spin. I couldn't really feel that anymore (probably this is what people call dwell time), probably also because of the of viscaria. I think I need more time to adjust.
Control: I can get good control, but I know this comes from the blade. Even my backhand now becomes amazingly good. I can block perfectly and punch like mike tyson. I think I prefer the unboosted h3 more (again, probably due to 38 degree becomes too soft and springy)
Conclusion: don't boost 38 too much, probably 1 layer is enough

also dont buy 38 degree H3 LOL