Whenever I receive loaner devices, I ask to keep them for months because long-term use reveals much. Initial reviews often miss important usability benefits or problems only prolonged usage reveals. No one can get to every feature or receive all the benefits in one day or week.
Something else: As I often say, in news reporting, or reviews, bias is inevitable. Time helps extinguish the new thing glow that can bias reviews and make them more favorable than the products deserve. As the glow darkens, sounder perspective brightens.