Well, that is a packaged unit with a clam shell heat exchanger with "O" rings. Most of those units will have popped "O" rings before there are any actual cracks in the heat exchanger.
Another common failure of package unit heat exchangers is burnout at the first turn of the clam shell chamber routing. This is due mostly to moisture collecting in the heat exchanger during down time or from moisture condensing on the heat exchanger during the cooling season.
The same failures you will find on this Goodman model will also be found on any other brand using the same type of heat exchanger.
Hey at least the latest goodman/Amana gaspacks I've seen have the Heat exchanger before the evap coil. Amana musta taught them that because the've been doin it for years. I have never found an Amana chamber cracked, have ya'll? I can't say that about any other brand, personally. Not knocking any brand, just an observation.