Stein67,
I have been using vArranger for almost a year now and can attest to it's quality and ease of use. The creator, Dan, is a stand up guy who provides us with outstanding support. I use the software with a Ketron SD2 unit which really makes the software shine. I can play just about all the Ketron styles up to but not including the Audya styles, and all the Yamaha styles up to the Tyros 4. If you go out to the varranger website I have sample songs posted along with a video of a gig I did with it. I use it on about half my gigs these days.
Here is the forum link:

http://www.varranger.fr/vforum

Deane