I don't like these mics. I think it depends on how much you care about sound.
You can always try one out. Guitar Center offers a 30 day return policy.
The better wireless mics have diversity and several channels to switch to. One thing I have found is it depends a lot on where you are using your wireless.
I have an expensive wireless, but can still tell the difference in sound between it and my wired mics. If you go completely wireless people won't notice the difference, but if you plan on keeping some wired mics out you'll hear the difference.
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