I doubt you will find many test of these large chargers, until now I have only tested one (From Ikea). I have another one in queue (From China) and the review will probably show up late December or early January.
ISDT has a series of large chargers, I have tested the N8, but not the N16 or N24 (They are probably similar in performance).
Another option is to use 3 or 4 chargers. Might even be cheaper, too. For AA/AAA NiMH cells, I like the simplicity and accuracy of the small Panasonic BQ-CC17 4-slot charger.