The Insignia is a nice tuner and at around $60 dollars I would consider buying
one too, but I bought the other two before the Insignia became available.
I like my Sangean because it is very user friendly but it does cost more then
the other two.
I have tried the AM stations around the Los Angeles area and a few of them
locked on the HD signal and it was very decent sounding, not as good as the
HD FM but surprisingly good.
I will say that HD tuners do sound very sweet on all of my tube amplifiers.
On my Roberts 770X mono blocks I use the Sony HD tuner and the music
just seems to come out of the thin air above and all around the system, a few
times it even startled me when the DJ would start to talk and it sounded like
it was coming from somewhere else in the room......