I might be misremembering this, but I'm sure the curved blades are so designed to promote an efficient chopping action. Everyone I've recommended them to IRL has loved them but I'm just so used to a normal blade that they throw my chopping action off-kilter.Not finding them difficult to use at all, but maybe I don't know any better, I'm no chef.
Shame, as they handle fantastically and I use the 8cm vegetable knife and 16cm boning knife for that exact reason.