Not at all - though I tend to split the channels (if I scanned BW in RGB - usually only for staining developer negs) & pick the cleanest. With normal developers it's usually the green channel - which is usually what most scanners default to for greyscale scans in the first place...
Other thing about the Canon is that I have much easier access to engineers here than with Epson - but bear in mind that moving the Canon may be a much bigger undertaking once it's set up, involving one degree or another of ink drainage.
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