I have used this for many weeks now.
I guess it's time for me to say something about this.

This thing does indeed provide a smoother acceleration to my car.
However, it doesn't save fuel in my car, not even 1% of fuel saving.
i just came back to JB from KL.
I had been cruising more than 700KM along the North-South highway.
I tested it on both rural and urban driving in the past few weeks.
I don't have heavy right foot.
I used RON95 fuel from Caltex and Esso.

Does it worth the money?
For me, yes it's worth the money for that smoother acceleration.