I bought these mics in September of 2010 and have used them for a teen singing group for the last year, performing with them for 66 performances.I have not had one mic fail to perform ever.I did have one of the antennae strip and not be able to be used again; however, you don't need the antennae in the first place. I have used them for almost the whole year without them and the mics work up to 100 ft still.One of my singers dropped one and it slightly lessened the volume on it compared to the other 3 mics, but it has never stopped working.The base unit is good as well with solid controls. The antennae are too big and one broke like any telescoping antenna does if you are constantly putting it up and down and packing up equipment so often. Didn't affect reception in the slightest.I have never had interference on the mics at any of the many, many venues where we have performed. I think the impurity of the sound from the mics isn't ideal, but I wouldn't expect a dramatic improvement even if I jumped up to mics 3 times this price.I'm buying another unit today actually, because there's absolutely nothing bad about these mics even under heavy usage and mistreatment by teenagers.