His comparison was excellent. I don't know of any other record that is more capable of enabling that type of comparing the systems as the "Quadrafile" album. For those not familiar with it, and I'd be surprised if anyone here wasn't, it's four sides of identical program material, differing only in how they're encoded. SQ, QS, CD-4, and UD-4 are represented here. His scope told all, and all decoders used did a fine job. But what I found really interesting was how the latecomer in the group, the Surround Master v.2, pretty much equalled, or surpassed, the performance of the Tate II, for SQ, and the Sansui QSD-1000 for QS. When I bought my S&IC, in 1980, it was twice the price of what the SM sells for now, and it couldn't do QS. The particular Sansui decoder he used, I don't recall ever seeing offered for sale in the US, but it's possible I missed that. Its SQ was the equivalent of partial logic. That had to be an expensive decoder in its day. Adjusting for inflation, that Tate decoder would be around $3900.00 in today's dollars. The SM, at US$599, given its low price and high level of performance, is a no-brainer.