1. In fact, “Impact” is a form of deformation of the table tennis board after being stressed. A certain "impact" feeling is actually helpful to feel the power transmission. There is absolutely no saying that "impact" is not good.
Of course, the degree of "impact" needs to be within a certain range. If you are a power-type player, it is recommended that you choose a relatively high "impact"extent, such as most carbon blades, which will help you transmit power.
And if you are a control-style player, I recommend that you choose a relatively low extent, as too much power delivery may diminish your perception of spin and speed.
2. 'reaction' is the form of expression of the degree of elasticity of the blade. It can be obtained from the height of the bounce of a ping-pong ball hitting the blade with the same force. The higher the value, the more elastic the blade.
3. This is what I just got from the designer, but it needs to be explained that this is not completely objective data, everyone will have a slightly different feeling, please feel it yourself.
Andrea, thank you for providing information and detailed specs for the HC Speed Light blade!👍