The effect of a solid connection on tone is palpable. This is the very essence of what an acoustic guitar is all about, so it makes sense that Martin pays attention to this detail. The nut on the Martin J-15 is white corian, which has an effect on tone and sustain. With the wrong nut, even the best woods can sound flat, but this is not a problem on the J-15. The 380 case will keep your J-15 safe when you're on the go, so you will not have to worry about long walks or trips. If you want the premium features of the 15 series but don't want to pay the higher price of the rest of the 15 series, the J-15 might just be for you.