I've got one of those. Its quickly become how I take batteries on any camping/etc trip. Keeps them organized and its just about the right size to fit anywhere. A little heavy, but thats the batteries fault.
Colorwise I like the glow in the dark for travel, can find them in a pack a little easier. But I've been thinking about moving over to all these for storage and doing 1 color for rechargeables (nimh), one for alkaline and one for lithium.