Chris, you are qualified to answer this question, and so is Jerry Huang.
Seriously, since I don't know:
What are the main issues with frame quality?
Potential issues I can think of:
Metal:
Type of metal alloy used
Type of welding used
Type of finishing method used
Quality of gadgetry applied: spring hinge, regular hinge, etc.
Design features:
"Monoblock" (which I think is where there is a tongue-in-groove fit on the eyewire screw piece?)
That design where the eyewire and spring hinge screw has to be put in together to get the eyewire to close.
Plastic
Type of zyl used: cellulose acetate, "SPX", "Grylamid", "Optyl", nylon
Method of coloration?
Method of lamination?
This is too exhaustive, but which of these factors are more important than others?
Even if we ask the right questions, how do we get the right answers?
How can we focus on quality when we don't know what it involves?
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