I had not heard of these pencils, so I went to Amazon to look. The reviews seem to be very good, with the occasional sour grape thrown in. The people who love them really love them.
I did see that someone who is an artist and sells their work was disturbed because they were not light fast. I guess she was afraid the colors would fade if she sold something.
Someone else said they were similar to Prismas, but better. She said they were not as soft as the Prismas, and required more layering to build up color.
I have a set of Prisma Colors but don't use them very much as I prefer to color with markers.
By the way, these Mitsubishi pencils are made in Japan, so out of the country, too.