I think the thing that ruled it out for me is that you can't use user styles, or styles from older Roland's. It's a closed ecosystem, and so far I haven't seen Roland do much towards adding more styles.

Compared to the BK9, it isn't even close. No VK section, no Key Audio, only a fraction of the sounds and a TINY style selection (about 170 total).

If you're content with just a few styles in any genre, it's got a lot going for it. Maybe even a throwback to early 90's style arrangers with few styles and no way to add more, and many of us look back fondly on the simplicity of those early days.

But simply adding a decent cheap 88 piano action controller to your BK9 might give you the best of both worlds and not leave you in a box, stylewise...