I know it's early yet, but I'm considering an amp upgrade for my Fostex TH-900, and I've been wondering if this might be a great option. However, since I'd be running it unbalanced, does anyone have an estimate on whether that would be worthwhile? Wondering if this makes sense for someone who may not use the balanced connection. I like the idea of buying a balanced-capable amp now to run with my Bifrost Uber, with the possibility of using it in balanced mode (with appropriate balanced DAC) some time in the future. What do you all think? EDIT: I'm currently using an Asgard 2! Also interested in the same question for those with a Ragnarok.