The answers are yes, no, definitely, and maybe.
It all depends on what you are going to use the tool for. I would not buy any of their welding stuff, but I do buy grinding wheels, gloves, and small items like wire brushes. I bought their bandsaw and like it for what it is, what it cost, and what it does. For tools that one uses rarely or only occasionally, they are a bargain.
Example: I needed a long tape to measure some property. I couldn't find anything over 100' that didn't cost an arm and a leg. I found one that was165' long, made of some sort of fabric or mesh, and was $10 on sale. I have used it a couple of times, and it's still good.
I have bought their impact wrenches, air chisels, and air grinders, and all are still functioning from occasional use.
If a tool is going to see hard use, I usually buy brand names, but I have bought a tool for a specific job, and figured it into the cost of the job, had it pay for itself, then last long past the job's end.
Definitely stay away from the welders and plasma cutters.