So, I asked strenx why he did that (from kinzu to mx518) and he said to me that he missed his own feeeling with the mx518 and was basically forced to play with the kinzu because of the sponsorship. He needed basically 2 weeks to readapt and he's now playing at his full potential.

So, guys, if you wanna buy a mouse, don't buy a kinzu, buy an abyssus or, maybe, a kinzu v2

I personnaly like the kinzu, it has an amazing shape, is very light and overall very comfortable, but you have to get used to the sensor to fully appreciate it. But overall, it gives you bad habits, and if you play with the kinzu for more than 1 year, it's very hard to adapt to a new mouse, you will need at least 2-3 months...