jultzya: you are correct, if the installation is not correct any and all systems will fail and have troubles.
and believe it or not most installs are not, we find most system have short or small returns, then overcharged to compensate,joints of furnaces, plenums,coils and filter boxes not sealed properly, etc..,
but i still would choose trane over theses other systems.
im a carrier dealer and have worked on all these systems, i have no worked on or seen a maytag.