I can only answer this for its big brother the Genos..
But i guess the answer is the same...

Whats great, is its powerfull sound
Easy way to opperate.
All the features the TRY to make it a complete experience

What is underpowered is onboard edditing, saving and managing sounds ( i dislike yem)
Whats underpowered is daw integration, daws are perfect for edditing and creating midi and audio
Whats a little me, is the many things that are still underdeveloped.

Like no way to create and load user arps..
No way to assign things like song parts not used to other things like the keyboard
No ipad app, which could be very very usefull
You can use extra effects from song parts to keyboard parts, but cant save this anywhere reliable in styles..
Also no effects for multipads... which kind of limits it
The sequencer is getting really old, its a basic midifile player, would love to see things like the pattern sequencer from modx added to it. Also incorporation of audio tracks, like having 16 midi tracks and 4 audio tracks for every sequencer file..
No audio over usb, would make daw and ipad integration much better..
Still limited in what you can assign to the sliders, knobs and assignable buttons.
3rd rank vocaliser
And more of these things


Yet all over the genos is an incredible experience compared to all other arrangers..