Given that its absolute maximum input voltage is only 6V, you'll have to think about what kind of batteries to use.
4x AA cells 1.5V will give you 6V. If the cells are new even a little bit more, maybe too much. With a voltage drop of 0.2V in the regulator, you have about 0.8V to work with. Split up to 4 batteries gives 0.2V per battery! If the cells drop to 1.3V each (still quite full), there's nothing left to regulate. And you can't use more cells to compensate... or use it with a 9V cell (bad choice anyway) or car battery.
Personally I wouldn't use it. I like boost converters like the MAX756 or LT1302. Efficiency is above 85% and they can suck the batteries dry to below 0.7V (MAX756). Of course they're not exactly cheap, roughly about 10$ for all parts.
I'd get a regulator with a wider range of input voltages, unless you have the perfect 6.0V battery with a flat discharge curve at hand.
Edit: seems like it took me half an hour to write this post :-)