I tried out the H3 National 40 degree, 2.2mm blue sponge.I tested boosted and un-boosted sheets.Boosting with 2 layers of Falco long term booster seemed to make little difference to how the rubber played, maybe more layers of booster are needed, or a different booster such as Seamoon.Top sheet was tacky and remained so over time and use, reducing slightly. my sheets were not overly tacky held ball for 3-5 secs.top sheet also felt quite hard to start with, especially the un-boosted sheet which needed to be softened up by playing for 6+ hours.Quality of the rubber is good, sponge is very dense with small bubbles. Used on FH wing.Spin levels produced whilst looping were very good, low arc, late dip and really good kick after the bounce. Technique is everything with this rubber, if you are used to rubbers with high catapult properties, it’s likely this rubber will not suit you!!Flat hitting is not a strong point, contact that produces spin is necessary. It can be difficult to get good speed and control with flatter hits.Counter topspin is good.As far as speed is concerned, it’s generally not fast, but if you have good straighter arm technique, good footwork, weight transfer etc and put everything into your strokes then the rubber responds and you get high spin, high speed loops.Top spin vs back spin - because this rubber has a fairly low throw angle some adjustment to technique may be needed, but once you get in the groove low fast (ish) spinny topspin shots can trouble your opponent, main from the acceleration when the ball kicks forward.Blocking is okay, but for me, nothing special, for a quicker block, technique needs to be more ‘active’.Serving - because of the ‘dead’ feeling - lack of bounce/catapult effort has to be put in, but serves have very high spin levels.Short game - control is excellent. Pushes can have high spin.Smashing - twiddle to your BH rubber!!!!!! ( if using a BH rubber with catapult effect)The main strength of this rubber is high spin capability and great control. It’s a rubber that will keep giving, the more you put in effort wise the more it gives you!! Is this rubber for everyone ?? No, advanced level players with good ‘Chinese FH loop’ technique will love this rubber!!