I also use the regulator on 6V batteries. I like the constant voltage. Like Wayne said, it just plugs in between switch and receiver. Nothing else to it. Weight is minimal too.
I like the ones from MPI or Central Hobbies.

BTW guys, Batteries America have a 2000 NIMH pack in AA size. Radical RC has only the 1650. Batteries America now offer the white JR plug for the newer JR Transmitters. I bought a 9.6V 1650 NIMH pack for my tx, and you can fly a week on that pack. Awesome.
I am not trying to trash or downgrade Radical RC (I am a customer there too), but found the packs from Batteries America a little more attractive as of now, and thought I pass on my experience.