I've used the DR-2d for three shows so far, always sbd/aud using the internal mics, because I didn't feel like bringing the full rig.
Long story short: I highly recommend it. In that price range ($200 from amazon or b&h), there's nothing like it.
Also, with good rechargeables or lithiums, battery life is not an issue.
What I haven't tried yet is running mic-in with external mics and and preamp. Max input is -16db. Not sure if that's enough. My mp3 player couldn't brickwall it though.