The 9000 Pro was a great concept that was poorly executed. Rather than expand on further software development to make the 9000 Pro what it should have been out of the box, Yamaha ditched the 9000 Pro altogether. Some of the "Pros" of the 9000 Pro were:

Great feeling 76 note keybed.
Extremely well built.
Lots of great sounds.
Expandability via Expansion cards.
Sampling capability.
Built in gooseneck lamp sockets.
Up to 256 note Polyphony with expansion cards installed.

Cons:

The CPU was extremely underpowered and couldn't handle all the tasks the 9000 Pro was capable of at the same time. That caused numerous problems such as timing issues, glitches, and lockups.

The Harmonizer was sub par compared to outboard processors. About the same as a Tyros II which is also sub par in my opinion.

Integration of expansion cards was an afterthought and it showed. This made full use of the expansion cards impossible.

Most real time controls were not integrated with the Expansion cards or synthesis features of the 9000 Pro. This could have been remedied in software updates but Yamaha decided not to support the 9000 Pro any longer.

The MTC timecode sync was atrocious. Caused mainly from the underpowered CPU being taxed.

Yamaha's customer support for the 9000 Pro sucked. Rather than admit the 9000 Pro had processor problems they tried to make me and many other 9000 Pro owners think it was an isolated issue. It wasn't, it couldn't be fixed, so bye bye 9000 Pro.

Yamaha had a great idea that was clearly underdeveloped probably due to some bean counter complaining about costs. When you are trying to build an all in one pro arranger don't cut corners. Yamaha should have taken a queue from Wersi and worked harder on the R&D. Pro's who are making serious money with their keyboards will gladly pay more for an all in one unit that truly works. Yes, your niche will be smaller at a higher price point but its better than making a turd that doesn't sell.