I think I can chime in on this subject because in the past I have owned an SD1 and presently own a Tyros 2 and just ten days ago have added to it a Midjay. I bought it because I still have a lot of Ketron styles and they are really useful for some genres of music, like Country, Soul or Rhytm and Blues.
Since the first day I have owned it, I have found with the Midjay the same sensations I had in the past with the SD1 - positive and "not so positive". The positive ones are the impact of the styles and of the drums: especially the sampled grooves really add realism to a song. Speaking of the "less positive" ones, in the first place -like Manuel said- many sounds are dated while others, like the electric pianos, are simply not on the same level with other arrangers, not only the Tyros but also the Roland G 70 or the Korg PA 1X.
I agree that the sound quality is very subjective, but there are other things that are not so subjective, like the ease of use, the friendliness of the user interface, a well thought-out operative system, etc.
Here again, I think that Ketron in general leaves something to be desired and it takes a bit of time and patience to get used to the way things work (or sometimes don't work).
I think I can say that, while the Midjay is a great all-in-one machine, for this same reason is not so versatile as an arranger. For example, you can edit your styles only to a (very limited) degree, the chord recognition is fixed and cannot be modified and I am not even sure which one is, but have already seen that some chords are not recognized, etc.
So, while I am very happy to have a Ketron again in my home studio, I wouldn't be so happy if the Midjay was my one and only arranger.

[This message has been edited by Dreamer (edited 08-25-2006).]

thanks to all, the question I'd like to follow up on is this:
aside from the vocalizer and file organizing talents of the
Discover, if one doesn't really use those that much (at least at this point in time), does the Discover offer advantages over using a straight controller? like overcoming what you see as the drawbacks of the Midjay e.g., better electric piano sounds or some others, ease of on-the fly operation live, etc?
on the flip side, would I be better off with Ketron's
arranger-module if i don't need all the Midjay functions?
MM