I like the Hitachi Impact. I've never used one for an extended period, on and off at best, but one of my buddies who used to work the teardown line with me actually preferred it over our Ingersoll Rand air tools.
Thing was FAST, when you depressed the trigger it actually STOPPED SPINNING, and his charge lasted for an 8 hour shift no problem.
edit: Lithium ION is fantastic!
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