Review (5/5): Bought two; both still going strong after 1 year
Got one for my wife and one for myself last September. Immediately applied Vaseline on battery cap o-ring per recommendations here. Also, they're laid on their side as they're designed to be, so the water doesn't run down to the battery compartment. Generally just careful with not getting the area around the battery cap wet. Both are still working with nary a hiccup. Sanyo Eneloop batteries last over a month when used twice daily.