i am curious too about how they perform, i just bought a demo one, but we were done before it got to my farm. Had a 9660 walker which i really love hope this one is as good. Never had any downtime with the old one.
Naturally, being conventional machines, the wts and t670 work better in tough conditions. Walker loss is virtually non-existent with the T and it makes a nice sample. On average the 9770 would have the upper hand on a hot, dry day and as the sun goes down the T would pass it.
Big strike against the T670- No HUR. Very annoying with a bigger combine. It's like putting the grain from 2 9600s thru 1 9600 unload auger.