I bought a used TNT a few yrs ago. I have enjoyed it. Because of its age but low hours I have replaced engine and cat pump. They are built to last IMO. Love the design.
Little Giant only takes about 30 mins
tops about every 3 months to clean the burner ring. Most of the time its a 15 min job.
They are very hard to find if your searching used.
Just like any TM if you work them hard they will need some lite maintance/repairs occasionally.
I like that most anything that goes wrong I can fix myself. There is no fancy solenoid or exchangers to deal with.
Engine, Blower, Pump and there belts.
Ignition switch is the most complicated piece on them. LOL