far as Chinese made tools, it all depends on who is making them. Case in point, the Harbor Freight Chief 4.5 inch air angle grinder is exactly the same as the IR grinder, right down to the external gearbox grease fitting, mirror polished head and flat throttle but the IR costs over 100 bucks more. I believe they are made in the same factory, probably on the same assembly line except the IR has a different logo on it. The HF air grinder is quiet as a mouse and smooth as butter, just like the IR (I have them both).
When I opened the heads up to check the grease, both had plenty inside and both had the same color blue grease too.
Another good example is the Icon 1/2" drive torque wrench. it's a mirror copy of the Snap On clicker except it says Icon on the barrel and it's over 200 bucks less. Have them both as well. If I turned both upside down and asked someone to pick the Snap On, they'd never be able to do it.
You usually get what you pay for. The exception is when you pay for the name. Today, it's difficult to ascertain where a tool is made unless you buy the really cheap stuff, then you know it's not made here because our labor cost won't allow it.