RNW

My chorus is getting ready to purchase an MD for recording of rehearsals, etc. Someone has recommended to them the Sony MZ-B100, which has a builit in microphone. I find it hard to believe that this is a better option than one where you buy a separate microphone. In fact I thought I heard that the built-in microphone was best for office meetings, etc. But now I don't know where I read that. Could you help me out with your opinions on this model? Thanks so much.