Ok, so great quality, sound is great but not pro, amazing looks, BUT...
I was dreaming to get this synth and watched tutorials and stuff, then I finally got it and started feeling more and more disappointed and ended up selling it. The lesson is learnt, what I don't like from this synth and will prevent such things in future is = Whatever you want to do here, you have to dive deep into the world of "shift+enter" yeah, like a freaking computer, wanna change the Arpeggiator? good luck, spend 10 mins minimum trying to get into the function plus trying to understand which arpeggio you like. Want to navigate or change voice? from Lead synth guitar to some e-piano? well not in real time, not during playing, not even on favourites, dive again into the depth of this synth.
If you heard about how cool that Roland offers the coaxial site where you can download for free hundreds of new sound/voices pack, yes you can do it and it is great but it is a pain in the ... to navigate into the shift dimension and shift from voice banks to voice banks, even weirder than with the built in voices.
From every 100 voices maybe 1 or 2 are actually useful, big minus.
Yes you can use the line in jack so that this synth would work as a huge effect pedal to your bass or guitar, but let's be honest, that's not the reason why you get a synth, better get effect pedals.
One thing that lured me into this synth was the step sequence drum function, which at the end, it's so complicated to use, to get the drum sounds you want and to set it up, you will spend more time watching online tutorials than enjoying and by that time you mood is death, better get a real drum machine.
Most of sounds of this synth are DJ oriented, I would say this synth could be a cool add for a DJ who has all his instruments on the table + adding this style of synth for some extra action. But as it goes for musicians no I don't advice you wasting your time with this thing. Better get something normal like a Yamaha MX, Roland FA, Korg Kross, etc.