Took a good 75 hrs to break in for starters. What impressed me the most was a slightly better control of the music overall. Kind of like moving up to the next level of power cord without the huge expense. To verify what I heard I put the stock fuse back in after a good 200 hrs and I lost the 'control'.
That said it wasn't earth shattering but a nice improvement for $129.
That said it wasn't earth shattering but a nice improvement for $129.