Having owned an Oasys, Mediastation, and Wersi I can say first hand the Mediastation does not make the Oasys redundant. The Oasys is a fantastic synthesizer but mediocre workstation. Korg never finished making a great sequencer/recorder for the Oasys so it never quite achieved TOTL workstation status for me. The Oasys sounds, keybed, and real time controls all add to making the synth features top notch though. Sadly Oasys sales were miniscule compared to other Korg products and Korg discontinued the Oasys. I doubt further software will be developed for the Oasys other than sound banks which means it will still never have a proper sequencer/recorder.