They all come from the same factory. Only diff is the price and Spigen ships from their warehouse.
The knockoffs are probably production runs at night or stolen from the china factory by workers.
What I don't understand is that Spigen only sells the tough armour in 4 or 5 colors but alliexpress sells up to 10 colors.
I'm pissed I paid $30 for my smooth black when I could have gotten 10 tough armours in 10 colors plus 10 screen savers for same price!!!!!
http://m.aliexpress.com/item/1233143874.html?tracelog=wwwdetail2mobilesitedetail
I wish this was true, do you have any proof?
As far as my experience goes, I did buy a couple of knock offs (slim armor) just to see how well they'd par against the original spigen slim armors.
Honestly, the original ones are good. The knock offs vary by quality; some are good, some are not. I did read somewhere that these knock offs are rejected products that did not pass the quality standard? So one can probably assume that some of them do come from the same manufacturer. In general though both the knock offs and the originals don't really vary much by quality.