Great sound. Very friendly instrument and voice.
I will add no more than a gimmick. input impedances of 600 Ohms XLR are we making a big loss of potato (33%) at microphones preamps ... So, if you want gum, you better have a small mixer to plug into the line inputs. NB: They have corrected the fault on the part JAM 100 which has inputs to 1k ohms (it is far from a 2 MOhm Fishman Loudboxer but loses less potato (13%). The JAM ring 100 so as hard with a microphone despite 3dB SPL difference (JAM 150 2x should sound louder).
Yet I highly recommend 150 +. It sounds much better than the JAM 100 which, in my opinion, a sound too metallic. Indeed, the lack of JAM 100 low and roundness not JAM 150 +. JAM 150 + is warm, respectful of your instrument and also works for low (as they are not active).
I had OCCAZ (nine to nearly three months), under warranty, 600. it's well worth.