As a beginner with just 5 months of experience, I'm afraid that my review won't bring much to your lives, but I'm blown away with this instrument.
It has a beautiful, highly customizable sampled sound with a well developed, easy to use PianoRemote app. Action is lighter than Roland's PHA-50 and far more responsive - Roland FP-90x felt heavy and sluggish in comparison. It feels like there is not that much depth after you press-down a key and the keys bounce a lot upon release, both of which I found distracting at first, but quickly got used to it. There are visible jumps in height between certain white keys, but again that's just minor nit-picking.
Build quality is great, and I don't get how people can have problems with fingerprints - I don't have that issue at all. I don't travel with it, but I appreciate the instrument's weight, as it doesn't feel like it will break the furniture while playing it.
For the first time in my life, I'm actually in love... and it even says 'Goodbye' to me, when I have to go away for a bit.