I find the silence interesting of itself.
Summer weekends aren't that busy on the forums. I wouldn't take it personally.
The autofocus adjust is a neat feature and works as advertised, but in several years of working with clients with Phase/Mamiya bodies I can only remember two (maybe I've forgotten one or even two?) clients that required a focus adjustment on their body (which is covered by warranty and takes 1-2 business days at a service center). So the value of the autofocus is probably not, in and of itself, worth going to the DF+.
That said the "autofocus improvements" which are a mainstay of any/every body update are, in this case, genuine and significant. Specifically the DF+ locks focus faster and with greater perceived confidence (far less hunting and less often makes a minor focus adjustment at the end of a long focus throw change) which makes using it significantly more effective for spontaneous photography. I have the blessed position that when I shoot a wedding
, which puts a lot of demands on focus speed/accuracy/confidence, I can check out any of our rental gear which isn't already reserved; I'm just about equally happy if an IQ160, IQ260, or IQ180 or IQ280 are available, but if a DF+ isn't available I'm disappointed.