This is a first-impression review. I can't tell you if they will last as well as a more expensive knife.
The build quaity is, overall, adequate. The handles are, I think, low quality soft wood (my Winsor and Newton knives look like they have hard wood handles), and are already sporting a few dings. The blades are reasonably flexible and work well, but they have a few sharp corners that I am wary of. The ferrules aren't as tidy as those on dearer knives.
But that price won't break many piggy banks. This particular knife can be acquired for under £4, as can may others in the Winsor and Newton range.
It is worth shelling out for a selection of nicer knives, but the Chinese set will provide an introduction if you're feeling impoverished, and you get to play around with a few different shapes while you're at it. Filing the corners lightly might be a good idea if you do go for cheap and cheerful; it is quite possible to cut yourself, and the canvas may also be at risk...