They seem fine based on the thousands of reviews they are getting on Amazon. Mostly concerned that you seem to see something in the picture that determines how flimsy the frame is when you haven't actually tested it or even seen it with your own eyes. Is this the same deductive reasoning you are applying to the burners?
I ask this not to be a jerk, but for those of us just getting started we rely on the advice you give and have no choice but to defer to your experience and wisdom. But if that advice is baseless then it's not very helpful. Especially when you are claiming something is "junk" largely based on what you assume...from a picture.
Again I humbly request if there are better options out there please give an example. I look at this as a easy gravity setup for someone (me) with no welding skills. Only thing I have seen comperable to this are the "art" teired systems sold by morebeer and such, and of course what skilled people make themselves. That's not an option for me, so if you can actually show something that is a better alternative in both functionality and price wise I would be eternally grateful. As someone who is new to all of this, I honestly do not know the difference and would appreciate some non-biased and honest advice.