Nice review, I was also contemplating about E1DA a while back also. But since I don't have any balanced cable/headphones right now also it sounds like HUD100 sounds warmer so it's probably more to what my preference lies, I'll skip the E1DA for now.
I'm currently using Dragonfly Red, do you think it would be worth while for me to try HUD100? They're about similar tier, I just wish the bottom end on Dragonfly Red is a bit tighter also more in quantity also reaches lower.
If you haven't heard the Dragonfly Red then my apologies, but otherwise any input is much appreciated! Thanks!