I bought a box of these as a cheaper alternative to Derwent. And I hate them.
They are very gritty - a good pencil should glide across the page. These feel very rough and scratchy. Sometimes they don't even leave a mark on the paper, other times they scratch the surface and damage the paper.
They're very hard, a 2B in these pencils is nowhere near as soft as a 2B in Derwents.
They would be okay to buy for a child. Or to use for very rough work, but for a professional artist I would suggest they go for a much better quality brand.
I for one will be sticking with Derwent in future.