Quoted from Arstechnica........'Unfortunately, the phrase "USB 2.0" does not necessarily mean 480Mbps of throughput. USB 2.0 now has three different signaling rates: Low Speed (1.5Mbps), Full Speed (12Mbps), and Hi-Speed (480Mbps). The marketing and advertising departments of product manufacturers like to put the words "USB 2.0" on all of their product packages. This can be really deceptive since most consumers will see USB 2.0 and compare it to an older product with the USB 1.1 moniker and think "USB2 must be better than USB 1.1!" Naturally, the consumer is unaware of the difference between "Full Speed" and "High Speed" (this is something akin to the old naming snafu with floppy disks: does "double density" or "high density" hold more?).'
There will not be any speed increase when using a scanner as the mechanics takes yonks to fire up. You will only notice the speed increase when video-editing or backing up files larger then 2 Gb. Same with printing, no difference in USB1 or 2.
I've been trying to convince people for ages that their USB 2 gizmo, whether that be scanner, printer or one of several others is, because of mechanical considerations, so intrinsically slow that it matters not one atom if it is USB1, 1·1 or 2.