Stein,
I opted for the S950 even though I presently do own a Tyros 4. My decision was based solely on the need to have a lighter keyboard for my gigs. So far I have been very pleased with it.

I will take a very serious look at the new PA600 when it becomes available here in the US too because I like the variety of having two different keyboards.

I can own both of these keyboards for about half of what the T4 costs these days.

Deane