Ive got one of these and also the standard dual mic version br-903
Both are pretty good really for normal speech but steer clear usng these for karaoke.s as they sound cr*p
The headset is ok, but sometimes get slight distortion and interference.
The handheld mic,s are about the same as the headset, but when you use both channels on the br-903 (use both mics at the same time) there prone to get interferece quite bad.
Any more i can help with let me know
Cheers