Goodman bought Amana, but I think they still market some under the Amana name. When I worked for an HVAC/Electrical co., most of what we installed was Goodman. I think they are nice units. Easy to install and repair tech friendly. I personally never did any warranty repair work on any that were less than 3 yrs old, and even that was only a couple times. Both the furnaces and AC units. I personally wouldn't shy away from them. Check them out.
It's inevitable....build a million things and you're bound to have a thousand fail