Like others, I haven't used a hand-scanner since the 1990s, but experiences all the problems above (wobbly or steched images, multiple scans and so so forth) also, the scanner was not wide enough for an A4 in a single pass and joining multiple scans with different distortions because of different speeds was a nightmare. I would avoid hand-scanners for anything bigger than a bar code myself.

I have used a digital camera to capture pages and that is very fast but is much lower resolution than a scanner even for a really good camera: whether that really matters depends on what you will do with the images afterwards