I will also concede that Goodman/Amana probably wouldn't win any best of the best competition.
I see it more of as a value based question.
You can have 95% of the functionality, at 30% of the cost. To go that extra 5%, you double or triple your cost and I cannot recommend that for your average user.
Corvette vs Ferrari.
Furthermore, Amana/Goodmans new 96% modulating furnaces are very nice and they are covered by an equally nice warranty.
The heat exchangers are warranted for the original owners lifetime and everything else is warranted for 10 years (non transferable). For a little extra, you can bump that up to a transferable 10 year parts and 10 year labor.
That is, however, just my two cents.