This is my quick take on Ketron stuff,

They are made by a small company in Italy ( compared to Yam, Korg and the others)

There sounds are great, they have seem to have sampled their sounds for the live performance in mind, they have great features, great styles.

Their operating systems are the most difficult, easy, feature pack, confusing, delightful operating systems,

I know the current flagship the SD1+ is pretty long in the tooth, but still holds it own against the new guys. The SD5 is supposed to be a updated, but also scaled down version of the SD1+. You'll get some newer sounds and styles and some new features,

I'm looking at the SD5 but I would really want the replacemnt of the SD1+.

I have owned just about every arranger out there, and I always seem to go back to Ketron.

I had the G-70 and it was a beatuful baord, I think the soundset and styles were old and dated. the op system was great, and the vocalizer very good, weighed a ton, drums and bass, no where near the KEtron stuff.

Tyros 2 has some incredible sounds, great for recording, but the drums seem to be not as much of an impact like the Ketron, but the styles are good to very good and allot of nice moders sounding current stuff. Great op system, loads of possiblities, weird type of size, seems to not fit anywhere, with another keyboard, takes up too much space/

Basically, any Ketron you get, you will be very happy.

You can get the Tyros to sound very good too, but I would say the Ketron would be first

just my opinion