WELL this topic was started with a person who had a JP8000 already. asking if it was a good MIDI controller and if it should be kept as such. Then he sold it on eBay.
I still have my JP8000 and here's the thing. This synth was introduced as a flagship synth, utilizing modeling but still with tons of nice analog-type sounds and a bit more that the technology would offer.
So, even if a JP8000 isn't as good as most other dedicated MIDI controllers, all the knobs and sliders do transmit MIDI so you could use it as a controller and have much more left over with its array of built-in sounds and features.
I was thinking the synth was a bit dated being one of the first modeling synths and coming out in the 90s.. But who am I to pass that judgement? After all, most my other gear comes from the 70s (Rhodes, Minimoog, Roland SH-1, Ibanez AD-230). So with that in mind I took the JP8000 with me to a jam session last night because I knew there would be a keyboard player there. Everyone, not just the keyboard player, was digging the JP8000 and we realized that Roland put a lot of great ideas into this synth. As a standalone unit is is really great, so if it can be used as an adequate MIDI controller as well, then you're really getting something extra, right?