I've been playing with rakza 9 for about 2 years now (I used rakza 7 before), very similar to rakza 7 I found rakza 9 still had a grippy/tacky surface which meant that the balls dwell time on the rubber was a fraction longer compared to normal rubber so you were able to impart good spin. Rakza 9 is a harder rubber than rakza 7 which gives it a faster rebound effect and as a result is not quite as 'spinny' as rakza 7.
It's very nice to loop with as you are able to produce a lot of effortless power so you get good results, it's a very nice rubber to serve with as I was able to get great control and grippy spin.
It is a tensor type rubber so is fast, faster than rakza 7. It is well suited to an aggressive players looking for a bit more power but still with very similar characteristics of its predecessor Rakza 7 because of the tacky surface.