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well the millers has had mixed results too, not all good, with many cars making no power, my opinion of the smoother is that it reduced the noise of the s2000 noticably and the off throttle coast has improved and it is still better now (several months on) would i use it again ? Yes, as it is almost the same price as the millers stuff and it seems to work with no long term negatives (so far anyway) the balls are so small and literally there is no more than a desert spoon of them in the bottle, i cant see how it can affect the engine in any way, the oil ends up with more carbon deposits in it than the oil smoother molecules which are smaller than the carbon too.