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...but the 9000's diagnose, break-in, and refresh features are really worth the extra price. I've been using both chargers with AA Eneloops for a few years now, and all 16 of my batteries still charge and work as new.
I have 48 Eneloops/Duraloops, the oldest dating back almost 5 years, and they're all going strong. Another important consideration for any charger purchase is the maximum charge/discharge rates of the stations. Some 4 cell chargers will drop the rate if charging 4 batts while using a higher rate for 2 cells, and the same scenario when discharging. Important to know how a charger will perform while charging/discharging multiple cells. I credit the 9000 for the strong health of my batteries... it's higher price/better performance has saved me money over the long run.