I have a Jet 5x6 that I bought in 2015 or so; use it with Starrett or similar quality blades, that I order from McMaster Carr. You need a minimum of 3 teeth in the material, so a 10-14 tpi works with 1/8" steel, but I have other pitch sizes as well.
The main upgrade I did was to order a hydraulic feed control mechanism from
Nebadawn Engineering. I always struggled with getting square cuts, and the weight of the top will push the blade obliquely. The spring mechanism that comes with the saw is too crude, and does not allow easy correction for the type and thickness of material. Since I installed the hydraulic feed control mechanism, I am getting beautiful square cuts. Get the one with the dial, which allows an easy adjustment. See it in action
here.
The second upgrade is a plate for when I use it in vertical position, from 3/16" steel. Makes a big difference.
As for comparison between HF, Grizzly, Jet, etc, I think you get what you pay for. Yes the castings look similar, and they may all come from one (or a few) factories in China, but the Chinese can make HF disposable junk as easily as beautiful, high-end Apple products. The client orders the specs and QA level, and the Chinese will build to spec. So despite superficial similarities in shape and casting, the various brands have different quality, fit, and finish levels. Jet is about a mid-level product.