In my opinion, the SD1 is the overall winner in styles, and sounds. But the operating system is very confusing, the layout sucks, especially in dimmly lit situations.

The overall fidelity is a little more on the midrange, but its great in band situations and soloing, Also they have a problem with notes dropping out when using the vocalizer too.

playing a midi file isn't as fast to call up, and the reg system, while still better than yamaha's is still not very user friendly.

I think even though the SD1 is getting a little long in the tooth, it's still among the top 3.

It all depends on what points agravate you the most to drop it in the ranking,

I still love the SD1 and the minute Ketron comes up with thier replacement and hopefully a major op system upgrade, I will be the first in line.

so in overall order of styles
SD1
G70/Tyros
Korg

Single sounds
Korg
G70/SD1
Tyros

Overall operations
G70
Korg/Tyros
SD1

Midi playback
G70
SD1
Korg/Tyros

Vocalizer
G70/Korg
SD1
dead dead last Tyros

Weight
Tyros
SD1
Korg
G70