I have the newer Spectrum from HF to use with my big compressor, but then got the medium size Earlex turbine job. I like it much better for heavier finishes. I was able to spray SW Emerald thinned only a little more than spec. If I were to buy again, I would go for an even larger one.
The reviews of the HF Black Widow are excellent FWIW reviewed for painting cars. I also have the old cheap HF 2-gun $30 kit. Painted a couple cars with it. I use much higher pressure than it is advertised for. More like a traditional gun. Spectrum is a little better, but not by much. They of course can't spray thicker finishes like the Earlex and similar. Maybe less overspray, but still makes a mess. Before my next project, I am going to adopt my pop up awning into a set up booth. Probably using screen to keep the bugs off outside.