I order from Northern Tool every once in a while. There is no store near me.
Tractor Supply gets me a lot. I buy tons of stuff from them from Gun Safes to my Zero-Turn to their nuts and bolts by the pound! (By the pound pricing on that is really a good deal)
Harbor Freight is just what everyone has said. OK tools for light duty use. Some things you really get a good deal on. Other things break fairly often.
I have a whole garage of HF stuff. Don't waste your money on their drills. I bought one when my Dewalt died, thinking I would not need another drill/screwgun. Has hardly any torque. You can stop it with your hand. I did save mine though and use it to set down my stabilizers. I burned up a sawzall and an angle grinder.
They do have a bunch of neat little items. I like their caulk savers!
Items that are good to go are bench grinders, drill presses, bottle jacks, creepers. The Predator engines in their gas powered items are pretty good running engines.
Any higher dollar item, I will get the warranty. I bought one of their 8700/7000W generators (Predator engine) and it runs great starts on the first pull and yes, I got the extended warranty. I back-feed my main panel in my house when the power goes out and I can run quite a bit.
I have an engine stand and engine lift. (can't really break them) I have a cheap flux welder I taught myself on then I bought a better brand MIG.
I have a table saw and 12" miter saw - they work pretty good for my use. I built my clinic and shed and do projects around the house and they get used quite a bit.
I have about 6 of their free 25' tape measures laying around the shed and garage.
The mantra of Harbor Freight is:
"Everything eventually turns into a hammer."