I tried three models of the Countryman E6 series and they all were horrible. Feedback was off the charts, the sound was quite thin, and there just didn't seem to be any adjustment that provided the same, robust sounds I get from the Crown CM-311A. I was fortunate with the
Countryman mics in that I borrowed 2 from a friend and had no problems returning them to him. The third one, which I purchased from a retailer, however, was a problem. I informed them up front that if the mic did not provide the sound quality without feedback, then it would be returned for a full refund, not including shipping. That agreement was made over the telephone with a salesperson that said he would note that on the invoice. NOT! When I tried to return it they said state law prohibited them from accepting mics for returns. I said OK, but here's the deal. Your salesperson made a deal with me for returning the mic. If you don't live up to that agreement, I'm calling my credit card company and telling them not to pay the bill, and to knowledge, there is no such law on the books, state or federal. They agreed to give me a full refund.
Gary