3% FWHM for something you could, at one time, buy for under $100 on eBay is very good. A typical scintillator + photomultiplier detector will get you about 6-7% (NaI:Tl scintillator). The Radiacode, which is super cute and all, gets about 7-9% depending on model.
Narrower FWHM means you will miss fewer energy peaks from isotopes.
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