My favorite among Nittaku products is their 3 star ball. An year ago, I bought one of their Haneyoshi defensive table tennis blade. That was not a suitable blade for me.
For a while, I have been looking blades made of willow and came across Nittaku Willtria. My expectation of Willtria was less speed than Butterfly Defense II and more rigidity. As usual, I prefer weight less than 85 gm. Unfortunately, the Nittaku Willtria could not give me anything that I was looking ...