No, they won't spam you. It's still considerably smaller than most flatbeds. What you get Like the 260C, the 620C is a no-frills proposition. There's no power switch - if you want to turn it off, you unplug its AC adaptor. Better specs The 620C beats its predecessor in both resolution and colour depth.
Numbers are all very well, though - the big question is whether it's actually a better scanner.
If you regularly scan very small things, or need fabulous detail, higher than 300dpi resolutions will be useful to you. But for the everyday tasks for which most low cost scanners are used, 300dpi is plenty. Higher bit depth is a more useful feature. If, like most users, you let the scanner driver software spruce up the scan a bit with level and gamma adjustment, it pays to have more bits per pixel to play with, so that even quite drastic manipulation of the image as it's acquired won't result in the system running out of colours and giving you an ugly, banded image. The fact that your image-tweaking isn't necessarily the same for all three colour channels, but the scanner can't assign more bits to one channel and fewer to another, means that this spectacular feat is often impossible.