I had a chance to hear this at CanJam Singapore and it sounds amazing. For the price, I honestly have some regrets buying my 707.
The only drawbacks that are glaring are that it runs pretty warm especially in Class A mode and the battery drain is quite fast. I recall running it in 4.4mm HP out in class A and I notice the battery life sliding down quite quickly.
That being said, AKM's revival coupled with Hiby's tuning is excellent. It keeps the details but smooths off the edges. Highs are stretched, bass is more rumbly than incisve and the mids are

. Voices, male and female, sound so sweet and it is addictive to listen to. It really reminds me of my own Topping D70s+A90 but taken to another level. Coupled with that Class A amp, this player is really oozing that naturalness that I like.
For the price, its quite the recommend from me.