They have been tested somewhere here though, and were as good as any other nimh, I think they are made at the same place as loops.
Yep 1900mah: Test/Review of Fujitsu AA HR-3UTA 1900mAh (White)
Its a convoluted history, but basically Twicell makes them all. Fujitsu is closer to being the original than the others as Fujitsu bought the Twicell battery factory when Sanyo was sold to Panasonic as part of some FCC deal. Or something like that.