I think the point is that even "good brands" sometimes have both "high end" and "low end" tools, with the same brand name. I believe you usually get what you pay for.
I know that sometimes, a manufacturer will make things of "different brands" that are of the same quality. The deal is, that the same "brand" also hires others to make things of different quality (higher or lower). So even though the "manufacturer" tells you the tools are made in the same place, you may find things with the same brand, made elsewhere, with a different quality.
(Geez, I know what I'm trying to say, but this is hard to put into words).
I guess the best way is a made up example:
Brand Z and Brand Y both sell "left handed monkey wrenches".
Factory A and Factory B both make "left handed monkey wrenches", but Factory A makes them of good steel, and Factory B makes them out of pot metal.
Brand Z sells wrenches from both factories.
Brand Y sells only the wrenches from Factory A.
A guy from factory B sees they're making wrenches for both Brands, and says "they're the same quality".
Well, yes, and no.
You buy a wrench from Brand Z without noticing it's the Factory B kind, and since you heard "they're made in the same factory" you expect it to be the same quality as Brand Y.
The wrench breaks the first time you use it.
You decide to go and buy Brand X again, because obviously, Brand Y and Brand Z are junk...