Hey Aidan, as far as I know, the Eden core tone remained pretty constant until the new-generation Terra Nova product range came out - maybe other forum members could give their views. All I can say is that I really like it and I've ended up spending a fair bit of time and money to find something more powerful (but not much bigger) that sounds as good. It's obviously subjective, but the reliable test for me is how good an amp sounds with everything set flat, and the WTX264 certainly passes that test for me.