I bought it mainly for the newer Sterns as they very, very clunky and noisy. WNBJM in particular.
Havent put them on any other manufacturers as they haven't needed it.
I agree the sounds of pinnies are awesome, but the newer games mechanical sounds drown out the sound effects.
That is how I feel any hoo. I should have done a pre and post fitting video for others references. Nigh and day.