Insane amp. The 3D feature is AMAZING and is great compliment to iems imo. I use the 3D to really wake up the soundstage in my Katos. On Anandas it seems to add some more separation and bring up some otherwise recessed details in addition to added the staging.
All that said I noticed if you like your music BASS heavy... That as the battery starts to get low you will start to notice more and more distortion in your sound if your bass is turned up. If your amp is always plugged in, then it's not a problem. But if you're wondering why your music sounds a little worse... After a listening for a few days without charging... Try charging it.
8/10 would buy again.