In my opinion, Harbor Freight tools are fine for a one time job. If it's a tool that you plan to use for years to come, buy something quality.
In my case, I needed an angle grinder a couple of years ago to convert some old kegs into brewing kettles. I could foresee no time when I would ever need one again, so I opted for the $18 HF grinder over the $75 DeWalt. When we remodeled our entire kitchen down to the studs, I opted for the Milwaukee Sawzall because I knew I needed a tool that could handle the job and wouldn't break in my hands. I figured any trip to the ER I could potentially avoid was worth the extra money.
If you plan to use it for more than one minor job, go with the quality tool.