Sorry to be the bearer of bad news but there still is a problem with how 4 tuner Tablo handles 1080i video (not film).
Yes there was a significant improvement in the latest firmware update but the issue is not resolved.
The easiest test is to watch a 1080i broadcast of “The Price is Right” on CBS and see the image degrade as contestants run, jump and scream. There is also macroblocking on NFL games during motion which should be obvious if you compare it to the same broadcast directly to the TV or via another source. You may not be bothered by these issues on a Tablet or phone although you still should be able to see them. Viewing on a regular TV or big screen, picture quality matters and these issues are obvious. Noticeably poor 1080i video picture quality is not an issue for satellite, cable or Tivo whole home streaming solutions so there is something wrong with the Tablo that needs to be fixed.