Bought 2, both work perfectly fine.
It makes you go to the official https://setup.office.com/ and inks the key to your MS account.

Todo perfecto y rapido, realice la compra y descargue el codigo, luego ingrese el codigo en mi cuenta de microsoft y listo. El software queda guardado en mi cuenta y lo puedo descargar directamente desde esta en cualquier pc. Solo sirve eb 1 pc

Does it work? I'm about to buy, and just want to know if the reviewing feature is legit.

Works Instantly and ties to your Microsoft account, was skeptical at first but the reviews convinced me, thank you!

Perfect!