I have been getting a lot of questions from readers of a sound advice column I write about getting their first P.A. system. I always suggest they buy SM57/58 mics since I really feel for the bucks they can't be beat but I'm getting questions about mics like the Behringer XS2000 which can be had for $20 each and the Samson R21 mics. Anybody used any of these cheapo mics and have any comments? I have recommended AT Pro 4's which can be had for around $70 and I have tried, but can a twenty dollar mic be at all worthy?