^^, ^ At one time, there was a Tascam rep (Tom Duffy) lurking here, but no longer. I'll leave it at that to avoid bringing up old arguments. You can still find him on JWSound and occasionally on Gearslutz.
I wouldn't hold out too much hope for firmware suggestions. I have maintained a firmware update request list for the DR-70D for quite some time, and sent it to Tascam several times but never received a reply.
You may be the only member here at TS who has purchased a 701D, or at the very least the first who has posted about it. For those of us who bought the DR-70D, the 701D may not be enough of an upgrade to justify the much higher price. My personal view is that the Zoom F8 represents a much better value, and you'll find several people here who did in fact upgrade from the DR-70D to the F8. So I'm sorry to say that you may find very few people to share experiences with regarding the 701D at this point.