I'm sure you've looked at the reviews. They are all very positive. http://www.audioholics.com/av-preamp-processor-reviews/classe-sigma-ssp-and-sigma-amp5-review and also Kal's (Kr4) review in Stereophile though I can't seem to find the link for it on Google. My recollection is that he too thought very positively about it. Kal followed up an article a few months later on the Krell Foundation processor, which he also gave very high marks to.
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