I've got my replacement box on Saturday. Don't see much difference compared to the previous one. The same software version, the same bugs, the same OTA reception. Had 3 lockups already: all when switching channels (I think this is a software bug, though). The signal strength on satellite channels actually went down from 71-72 I was getting before, to 61-63, but this doesn't seem to affect the signal quality.
First, I thought the channel navigation became twice faster, but then I realized that the box was set to 720p. And I know that channel navigation is always faster in 720p mode. When I switched to 1080i it returned to the usual 6-second delay.
The only way I can tell this is a newer box:
1. The software is pre-loaded: there's no need to do the 20-minute download.
2. All OTA channels worked without requiring a factory reset. (My previous 2 STBs both required a factory reset to get some of the OTA channels.)
Other than that, don't see any difference.
P.S. Never had to do the factory reset on this box. Will try to keep it this way!