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..no, flatbed is more convenient basically, as you can "feed" it more negs at once, set up your frames, and have the software scan one after the other - while with the scanners like the one above you can only feed one strip of 6, and have to advance frames by hand.
They generally deliver better quality though as they're "dedicated" film scanners..
Oh and yea, mine is slow as well (at least 3600dpi and up, not to mention with ICE dust removal)..
It's an "accident" that happens when you have this type of scanner -
And you advance the mask to the next frame during the preview scan.