I've struggled with cheap needle files for over a year now. Finally broke down and bought 2 different size sets from Rio Grande. I went for the swiss made F. Dick files. A 6" set and a 4" set.
I can tell you this, from very first glance without taking them out of the package even, there is NO comparison between cheap files and these.......none. Visual inspection alone reveals absolute precision and top notch quality. Then comes the joy of using them. If you think cheap harbor freight files cut good (and they might do okay) wait till you use a set of better files.
I'm sorry, and I'm not trying to argue, and it's nothing personal, but harbor freight and other cheap files are nothing more than the bits of scrap metal found on our shop floors compared to good files. Like I said, I've used the cheap ones for a long time. The files are soft, bent, wavy and not parallel and the cutting teeth are uneven, not of uniform size, dull, etc.
If the cheap ones work for you, great. This is not a plug for F. Dick files either. I was just blown away by the precision and quality of these and they work as well as the look. I'll never waste time and money again with set after set after set of junk files.
If you get the chance, invest in some good ones and you won't be sorry.