There are a few Ketron players here. I was out of town Monday and Tuesday playing other towns, then had to work last night here as well.
I am very pleased with Ketron, having owned X1, SD1 and now Midjay.
They have their drawbacks, just as every kb does, but so far the strengths have kept me from changing again. I haven't seen anything I like better, but then there isn't much for me to see in this area. I haven't seen a Tyros 2, although I did own a Tyros, Roland G70 or GEM. I owned a Korg PA80 and the sounds on it rivaled the Ketron but the intros, ending and fills were terrible. I understand most, if not all, that has been corrected on the new korgs.
The operating system on the SD1 is unlike anything else and has a big learning curve. Still, once you learn it, it is very good.
Computer interface with the SD1 is behind the times, using a proprietary connection or floppy disk.
Strong points on the SD1 are of course the great live drums and bass and extremely versatile editing. It has a great vocal harmonizer and you can edit, replace and add styles to your heart's content.
The Midjay hooks up via a USB cable and appears as a drive on your PC. It has a totally new OS, similar to PC. Of course it is necessary to use a controller keyboard with the Midjay. Strong points are light weight, good sounds, wonderful drums and bass, MP3, WAV, DJ, Midi and Styles and lyrics all available at your fingertips.
Drawbacks are small screen, limited style editing and limited (optional) vocal harmonizer. Also certain playing styles, particularly if you use a lot of sustain, may reveal polyphony problems. It hasn't been a problem for me, but I seldom use big layers with sustain.
You can download owners manuals for Ketrons at www.ketron.it
DonM