Lets face it they are junk for the most part. I refuse to buy from Harbor Freight Tools. You get what you pay for there that is for sure. Everything I have bought there is junk.
I buy stuff from HF all the time and most of it works fine.
I have their Al bar clamps and the work great. I do stay away from most of their other clamps - they are kind of junky.
Also, their locking pliers (aka vice-grips) are hit and miss. I'll go thru a dozen before picking 2 that I'm satisfied with (they don't always work).
Their hand tools (sockets, rachets, wrenches, etc) are good enough too.
Their sanding belts suck - they lap the joint and it creates a bump - but i have a belt sander from HF that works great with Norton belts.
My 8 gallon air compressor is from HF. Does what it's supposed to do. I have a few air tools from them as well - they work fine.
Also, you can't beat beat HF for air lines and fittings.
I also buy plastic beads for media blasting from HF. Also, their air gun nails work as good as any.
The arc welding rods I buy from HF are just as good as the ones from the welding supply house but at half the price. I'm not welding anything critical anyway.
I buy casters from them all the time at 1/2 to 1/4 th what Home Depot charges.
I have a 1 lb dead blow hammer that works great too.
I have some HSS spiral router bits that work good for rough stuff. I don't use them often - I use my carbide spirals for good stuff.
I stay away from their wood chisels and wood planes but I buy drill bits from them all the time. Sometimes the smaller bits (i.e. 3/32 and lower) are not straight but I can usually find one that is in another box.
I also have a 4-1/2 grinder from HF. Their grinding discs are also a deal compared to others (HF/Lowes/OSH).
Anyway, it's not fair to say all HF stuff is junk. Some of it is quite nice (wrenches and such) and some of it is good enough.