As long as it turns on the motor doesn't sound like garbage I'd get it. Clogs are fairly easy to fix, these machines are kinda prone to them. There is a clean out port on the back of the machine, you can open it up and see. I would also look at the port where the dirty airstream enters the bin. Facing the machine it is on the right side up inside the housing above the dirt bin. I recently found another Thunder at GoodWill myself, the dirt path from the intake in the bin all the way to the floor nozzle was clogged up.
Cameron
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