I work for O'Reilly at their DC out here.
O'Reilly/Ozark is the same company. O'Reilly bought Ozark, or they were Ozark, or something like that, can't remember the exact story. They're basically the same now, the name of the company is interchangeable between "O'Reilly" or "O'Reilly Ozark". People at work call it both.
The employee discount varies according to the product. Typically the discount is cost, on some stuff it's cost + 10%, some stuff is cost plus a certain percentage. Depends on what you're buying.
Power Torque are actually not bad. O'Reilly sells Power Torque, Performance Tool, GM Performance, etc., which as far as I can tell are all the same product with different branding. We pull stuff from the returns dept. and most of the stuff is great. Built great, works great, no complaints. If a customer returns something we grab it, and if there's issues who cares, we swap out broken ratchets or whatever and we're good to go.
As far as I can tell these brands are made by
Wilmar, so far the stuff we use at work has been great. I have a bunch of socket sets, 3/8" and 1/2" deep well sets, standard sets, that I love to use. They are decent tools, on par with maybe Husky, Kobalt, etc.. If I needed tools at home I'd consider buying them, and not just because I'd get a discount.