For me, 3.1 on the Logitech Revue is a major disappointment. Here’s a copy of my post to AVS Forum:

Two fundamental changes are real dealbreakers. The picture quality of Live TV is visibly degraded. (I actually thought the deinterlacing in the Revue made my signal look better, until today’s 3.1 upgrade. Compared to the vivid picture of 2.1, the new image is softer and flatter with diminished dynamic range.)Furthermore, when you open a search box or the app bar over Live TV, the live image dims so much you can hardly see it. As a result, there’s no more doing a search while watching because you can no longer realistically watch that shadowy image.The new features are not compelling IMO. The apps in the Android Market are limited and, frankly, some of them don’t even work correctly. For example, I can’t get one of the file manager programs to see a SAMBA share on my PC, even though that’s a feature of the app.DTS audio in MKV files still isn’t supported and–though it hardly makes any difference–even the video for those files will no longer stream through the Logitech media player.At this point, I sincerely wish I could downgrade to the previous 2.1 software. The fundamental video quality of the box has been compromised and the Android Marketplace –at least as it currently stands–isn’t an acceptable tradeoff, IMO.

For all practical purposes (at least for MY practical purposes), Logitech just broke my Revue.