My Old man's 9 shot Tracker .22 passed all tests in the gun shop. He's the Nephew of a gunsmith, an "Old gun" guy, he's been shooting since the 50's, and he's the sort who asks for a chair and sits down with the gun for a good while before laying his money down.
I've seen him purchase exactly Three guns "new" ever. A Bersa .380, A Chief's Special in the 80's, and this very Taurus Tracker. 3 trips back to Taurus and It still can't function in DA reliably without locking up between cylinders.
Less than 200 rounds lifetime, each time returned from Taurus Service with a note saying they tuned and function tested it. This last time it managed the first cylinder, then froze 3 shots in on the second.
Not to take the wind out of the position that "It should have been caught in the Shop...Buyer failed to inspect" the ONLY way this gun would have exhibited it's Issues, would have been a Firing range on the premises, and precious few shops in Oregon have those.
Some are Junk, Some work amazingly well, but you won't know for sure till you put a few hundred rounds downrange to separate the two. For myself, I'd buy my buddy's Belly-carry ,rusted .357 in a heartbeat, I've shot it enough times that I'd trust it as a CCW. I don't know that I'd ever trust a NIB Taurus without an extended range session first.
Good luck though, I tend to mentally place the odds on them at 50/50, I'm just not a gambling man.