Can't say better things about it, absolutely amazing brush, extremely fine detail can be accomplished with this.
Only con and its not even noticeable for me but the brush dosrnt come with any caps for the cups so if your painting at tricky angles or moving fast with alot of paint it can be trouble some. But for someone like me using it for fine detail and using only a few drops of a color at one time its an amazing brush and I'd put it above iwata.
Parts and needles are much cheaper then iwata aswell and just as good quality. I wouldn't buy any other brush then the infinity.