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					Originally Posted by woob  What's the benefit of going metal for the chuck?
 Also just another question - what's the benefit of going with a hammer drill? Is there anything reno wise or new deck wise that would benefit from that?
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 Mostly durability, I think.  I really gored up the plastic chuck on my corded, and figured metal would be better.
You need a hammerdrill for concrete.  Though I'm not sure how well these cordless ones do compared to a real full size one, like a Bosch Bulldog.  That's all I have used.  If you don't forsee yourself doing any concrete drilling, then it's not worth having,I don't think.