You would think they test them, but who knows? I bought a low-end Acer laptop on sale last summer at Micro Center for one of my daughters. After a week it failed to boot (hard drive failure) so I took it back. Since it was still the best bargain at the store, I exchanged it for the same one. After 17 days the second one's hard drive failed (failure to find boot media). Since the store only allowed you to return it up to 15 days after purchase, I had to send it to Acer for repair and wait two weeks (I paid for shipping it to them too).
I know they weren't comparable to your high-end MSI, but two identical Acers both had hard drive failures with the first two weeks or so of purchase? I don't think I'll buy an Acer again.