I hadn't noticed but any informational tool can be useful as long as ya don't take anything as gospel and back check whether a designation is deserved for any particular model. If ya don't spend hours per week scouring forum traffic a tier list is a good tool to narrow down options... but where something gets placed may be somewhat subjective, but more often it's the result of a series getting put into a tier because of reviews of say a 750/850 model reviews, and then at another size range, sometimes even with a different OEM, the series designation still sits their despite another range being significantly better or worse than the ones responsible for its designation.