I found exactly the same thing (apart from the bass bit). I've had
@smial1966's Ether here for a couple of weeks and it took that long for me to decide I actually preferred it to my HE-560s, of which I'm quite the fanboy. Whilst I still feel the HE-560 has slightly deeper bass extension, slightly more open midrange and a (slightly) wider soundstage, the Ether excels with it's natural sounding, balanced signature. Treble is smoother and without sibilance (something that I do hear with the HE-560s sometimes), but still nicely detailed and, for want of a better word, delicate. I've always found the HE-560 to be perfectly comfortable for all-day use, but the Ether is off the charts comfortable and lightweight...and unlike most headphones out there, I don't think I look like a total dork wearing them (not that that's a priority for home use headphones). I also appreciate how much easier the Ether is to drive than the HE-560, which I think definitely opens up some amplification options that the Hifiman cans just wouldn't play nicely with.
As a value proposition, I still feel the HE-560 is a mid/high end "bargain". In the UK it's nearly half the price of the Ether, which to my ears makes the latter a tough sell. On the other hand, imho the Ether C is a much better value when you consider the closed back alternatives. This is the wrong thread for my detailed thoughts on the Ether C, but to my ears it's a more enjoyable listen than both Ether and HE-560, and has the bonus of being closed back (if you need that). So, whilst I can't see an Ether in my future, the Ether C is definitely going to be my next closed headphone.