FWIW for those of you who follow Rudess, I was doing some surfing over the net, and I found this.
Its seems that he is no longer using the OASYS in his live shows.
Jordan Rudess quoted from its web jordanrudess.com:
" I took the Fantom G keyboard with me on the tour instead of the Korg Oasys for two reasons.
- One is that I put a lot of thought and energy into the development of the instrument and was very proud when some of the features that I requested were part of the instruments design. Not only that- the features of the instrument make it a unique instrument in the vast world of keyboards. There is no other keyboard that I know of out there today that allows the seamless transition between large combination (Performance) sounds. This is the basis of my (and most other real players) performance concept!
- Aside from having the switching from one Performance patch to another being really smooth, I programmed the entire song set without using ANY outside samples. Everything was done with the Factory ROM and I did not feel I had to make any sacrifices to the integrity of my sounds to do it!
- Finally- I worked hard on this instrument both in the design of it and then the programming of the sounds and I am proud of what it offers for the keyboard world.
-Last comment- It's built like a tank."
Indeed, to me this synth looks like a metal brick in its design and construction

A pic:
