Have you ever actually tried to claim that free return? I've had multiple issues with stuff bought off aliexpress(wrong model, damaged, etc), best I ever got was a full refund and most were partial refunds.
Its indeed not modular, nor black. But regardless its still the only unit from a proper manufacture with a legitimate warranty. The runner up if you're in the US would be the lightly modified unit by Velka which is all black with a 1y warranty.
i'll state that this thread is about a 6 litres case, designed by NFC Systems, & that i mentioned some compatible PSUs as just a side-note.
however, i'll reply to all questions.
the 15 day free returns is a new feature on AliExpress, which i do not remember being in effect more than 90 days ago.
i've personally used it 3 times, and it works perfectly, specifically AliExpress gives you a pre-paid return label, which goes to a USA warehouse.
once that USA warehouse verifies that you sent back the correct item, a full refund of all fees/taxes & shipping is made.
additionally, all you have to do if you want 180 day returns is to purchase with paypal, as their paypal buyer protection policy supersedes any AliExpress policy.
i respectfully disagree with those stating that Enhance's warranty is better than what i'm describing, as Enhance's warranty only applies if you don't do anything to your unit, such as swap its fan out for a Noctua fan, which is what almost everyone on this forum keeps talking about.
finally,
@VELKASE Michael 's ENP 7660B unit which i've also recommended multiple times, is sold out until December, so its not an option.
so a true summary of this discussion is not that i'm right, or that others are right, but that its really an apples to oranges comparison, which doesn't directly apply.