+1. It's my setup for when I'm at work or am going to be out all day. Paired with an LR atty or, if I'm driving, a cartomizer, I have no fears of running out of power.
Another +1. When I get home, all I do is swap out my 17670 and LR atty with my 2 RCR123a's and standard atty, and I'm in...