I'm glad I bought the E12 when I did. I listen to electro, psytrance, techno, d&b about half the time, and a variety of metal and acoustic the other half. The boost that's on there now sounds great with everything! It's tight, impactful, and detailed in everything I listen to.
I thought I wouldn't like it as much with death metal due to how fast the drumming is, but when paired with my 325is, it sounds fantastic! The bass drum actually sounds like a bass drum and the bass guitar really stands out without becoming overpowering or unclear.
All this being said, if I ONLY listened to electronica, I'd probably want more bass. With my music tastes being what they are, the E12 is a near-perfect travel amp.