While I wouldnt use it for commercial use, for my needs the one from Harbor Freight works great. I do alot of soldering of heavy stuff on cars and guitar amps.
Now my IRON that I want is a weller adjustable. It does alot of stuff that I really need the high quality soldering iron for. I would say it would solder about 75 % of the stuff on a mopar.
Not trying to steer you away from a quality soldering gun, just telling you my experience.
If I ever replace my cheap sams gun with something else, I am gonna try and find something used on ebay. Probably a Weller also.