Yes, I have a wally and use EHD for DVR. Did NOT have to pay a new $40 activation fee from my 211 exhcnage.
No, it immediately wanted to reformat the drive and all recordings were lost. I was kinda expecting that so I was prepared. I have 2 Wallys and the same thing happened with both as soon as the drive was connected.
As for a review...The interface is much more modern but my 211 was 10 years old so that's to be expected. It seems much faster in changing channels, searching, etc. Its smaller which is nice and seems to generate less heat. Netflix is not active yet, says feature coming soon but to me that's not an issue. The issues I've noticed are two things.
1. When watching off DVR sometimes the skip forward or skip back will go way more than 30 seconds or back more than 10 seconds. I've skipped back 10 seconds and had it return to the beginning of the program 40 minutes in. I've been using fast forward and rewind to avoid this happening.
2. I cant pause OTA channels. It pauses the video and pixilate it but audio keeps going and when I unpause it becomes very pixilated and audio video does not match. Oddly, this does not happen if I am recording to DVR on OTA channel I can then pause while its recording.