Turns out i was on the latest firmware.
Some things i noticed which are, to me, a bit counter-intuitive:
Main menu scrolling, when you scroll clockwise, the items appear counter-clockwise.
Back button is the top right button, while (to me) top left button would be more convenient.
Holding the volume buttons when locked, skips to next/previous, instead of lowering the volume.
Now i'm absolutely not saying this is wrong, because it's personal opinion. However, as i said before: it would be great if we could set up functions per key ourselves.
Now some positives:
I love the weight of this thing.
Bright and clear screen.
Sound quality (duh) I noticed it's more neutral than the X3, and with my Grado in ears, i have to get used to it, but with my PS1000, it's perfect sounding.
Speed : it took about 10 second to update the library with 83GB of music. Daymn.
Rubber case: that's a solid chunk of rubber encasing a solid chunk of metal, feels high quality.
I don't think i'll ever regret buying this.