katerchenI have the one you linked, and while beautiful and well made, it is small, heavy and awkward for the lap. Also a little too shallow for inkwells of most sizes.
EarthnurseI'm actually not sure why it's called a `lap' desk ... they were not meant to be used as such. You'd use them to carry around writing essentials, but they were still meant to be placed on a normal desk, providing you with a writing slope.