Spectrafoo or Smaart?

I’m looking to invest in a mobile acoustic measurement software and am looking for opinions.

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I’ve been playing with the Spectrafoo Demo and I must say it’s very impressive
http://mhsecure.com/metric_halo/products/software/spectrafoo.html and it’s very competitively priced. The Main thing appealing to me about foo is the “Transfer Function Measurement System” I became familiar with while using a SIM system… This to me is the most valuable feature.

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