I sold my Modulus Quantum a few years back because I felt it lacked warmth. On live recordings, I'd hear the attack come through much stronger than the fundamental, and simply felt the tone had little richness to it.
It was definitely clear and each note was pronounced more than anything else I've played, but I just felt it was harsh.
Another problem I felt was it was way too strong in the upper mids...very honky sounding.
I've played other Modulus', with both EMG and Bart pickups, with wood fingerboards, composite fingerboards, and even different types of hardware, and could never get past certain tonal qualities.