I like to shop at Harbor Freight and they do have some excellent tools. Not everything is worth it though.
Case in point: Mig wire.
I was in the process of modifying a Harbor Freight 20 ton hydraulic press to 32 ton air over hydraulic operation. To allow for the extra 12 tons, I did have to add some reinforcement to the top and bottom of the press along with using a 1 inch thick plate with the supplied cast iron blocks for the table.
In the process of reinforcing the press, I noticed that the Harbor freight mig wire was crap! I mean it would not give the results I am used to getting with either Lincoln or Miller / Hobart wire.
I ended up grinding all the Harbor Freight wire welds off and starting over. Once I put the Hobart wire on, everything was beautiful.
I did do a few tests with the HF wire and found that the arc was not nearly as smooth as the other manufacturers wire. For some reason, the HF wire's arc was erratic and the welds were porous. It seems that the batch of wire I got had some kind of contamination in or on it. It felt oily and dirty. The areas I was welding were paint free and clean. So I got some metal and tried and tried to get a good stable arc and a good weld. It was just not going to happen.
BTW, I use a Hobart Handler 210 Mig welder using 75 /25 gas.
I will say that Harbor Freight do have some excellent tools and other products. I got a great deal on the 20 ton hydraulic press which is an excellent product. But there are some things that should be avoided and mig wire, at least for me, is one of them.