Well my experience did not go well.
I think the ambiguity of exactly how this is done caused some confusion in my attempted transition and loss of recordings.
There was a possible fault in the 4-Tuner unit that appeared to have caused some issues with updating to the latest firmware. After checking several times to make sure my recordings were still there somehow the drive was erased and set me back to square one. I know this is a rare occurrence it would be good however to know in clear terms how the process should be handled.
The lesson here is to make sure you have your recordings backed up somehow when making a move like this using one of the recording transfer programs mentioned on the forum. I have been using Tablo Ripper without any issue and it seems to do a great job.
I am a big fan of Tablo and you know you are one when you overhear someone talking about cord cutting waiting to board a flight and you have to tell them about Tablo ;^)