I tried two Countryman E6 models--both sucked. They were really not designed for singers, they were prone to feedback, lousy frequency response, and thin sounding. The attributes were: lightweight, nearly invisible and for someone providing seminars or speaking from a pulpit they're just fine.
Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)