I got word from Amazon that my Tenlog TL-D3 Pro was delivered while I was at work.

Given its "used" and "acceptable" as rated by Amazon Warehouse condition, and especially given my noob 3d printer status, what especially should I be on the lookout for as I attempt to see if it is a keeper?

Assuming I can find my way through setting it up are there certain torture tests I should download and run?

If it doesn't work, and I send it back, does it matter which of the various "Tenlog TL-D3 Pro" versions I order? is it ok to just go with the cheapest? If my wife make crossing the $500 budget barrier unwise, what is the very best sub $500 option? maybe just be patient and hope for a slightly less trashed TL-D3 pro to eventually appear from Amazon Warehouse if I keep my eyes open long enough?

Thanks again for any (further) help!