FWIW, I just returned the Insignia to Best Buy, last night. I had it and my BA hooked to the same antenna. The BA pulled in all of the local stations in HD. The Insignia only did about half and was unable to render the lone HD3 in town.
While I can live with the signal issues, the main reason for the return was an audio issue. There was a low level splatter in the audio. At first, I assumed it to be the station running the levels too hot into the encoder. But it was there on every station, AM, FM, analog and digital. And on both RCA and optical outputs. I even moved the box around to see if some other component was affecting it. Thought about exchanging it, but didn't want to have to go through three long lines at Best Buy on a single night. The 45 minute wait just to return it was quite enough.
Walking the fine line between jaw-dropping and a plain ol' yawn.