I washed them before using, so I've only slept on them for a couple of nights. I was immediately impressed by their softness. Since they're not a natural fiber, I wasn't sure how soft that a man-made material would be, but these are very comfortable on my rather dry skin.
I like the value, as well. They didn't cost $50 or more like some sets of bedsheets. The fact that they come with four pillowcases is indeed a big plus. The fitted bottom is more than big enough for my mattress.
I won't comment on the color since that is a personal preference. (I bought the blue, as shown in the picture, since it's not too bright.)
I can't think of anything negative to say about them thus far. So overall, I'm very pleased with my purchase. I would recommend them.