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I think there's also the matter that previous Zoom products such as the H2 and the H4N are well-known garbage. Unreliable, cheap sounding, etc -- not so different than a Tascam. Now, Zoom was always pretty clear that they were aimed at an amateur market in those cases, and marketed accordingly, so you can also assume some of the issues with how bad Zoom stuff sounded was attributable to user error. That said, an H4N should be qualitatively no different than a Roland R-26, yet I've heard many good recordings with the latter, none with the former.
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The H2 and H4N are certainly not garbage, the H4N is still used by pro's and I have an H2 that produces great quality recordings, and still works as well as it did when new.