I'd say one of the first things you should do is just test it out. Make sure it works. Walk outside and see if you can still hear it from the amplifier (as long as he is okay with this). Try to get feedback from it. See what disrupts the signal (e.g. cellphones, wireless internet, etc.). Even something like a microwave in a coffee shop can mess with it. If it's easily frazzled, you might not want it, but realize that it's impossible to find a perfect wireless system.
That said, Shure does have a good reputation. Laklander is right. I'd give it a look either way, just because it's so cheap and a good model.
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I love science, and it pains me to think that so many are terrified of the subject or feel that choosing it means you cannot also choose compassion, or the arts, or be awed by nature. Science is not meant to cure us of mystery, but to reinvent and reinvigorate it. -R. Sapolsky
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