I bought one for a different ax... Made a very very noticeable difference for the better. I am picking one up for my S4 in the near future. Not that this guitar at all sounds weak or flimsy - on the contrary, I just wanna take what it has and enhance it
I bought my first FU Big Block with the intent on proving to myself that it was all snake oil... I got it, installed it on one of my shredder guitars, and it kicked all kinds of ass. More overtones, better sustain, chunkier tone. Period.