I decided to buy this when my TK40D preamp started to play up. It's a simpler version of my preamp but without the Mid Contour, EQ bypass and notch filter. I gkfound the guitar easier to control tone wise and the buttons weren't in the way when I adjusted the EQ. Very easily fitted and the tuner is better on this one with it's green LEDs when the guitar is in tune. Very good value as a replacement on a G Series guitar. In conclusion I'm very happy with the sound, build quality and overall performance of this product