Eneloop is indeed good technology.
Self-discharge for standard Ni-MH cells is around 0.7% per day, with the highest-capacity cells hitting 2%/day. Self-discharge for Eneloop is around 15% after one year, with most of the discharge occurring in the first 180 days. Because of the low self-discharge rate, the cells are sold pre-charged to around 70% capacity, so they're ready for use out of the box.