I am a huge fan of the 80+ rating. To me that's what is the most important other than a respect brand and the right among of Watt.
Before buying I check some review sites for the score, pros and cons.
I have actually never heard of the tier rating on PSU's. Reviews don't included them often, do they?
Maybe i have to start including that into my consideration when buying PSU's.
I have some reading to do it seams.