For the price they are okay. They are very thin, thinner than most microfiber cleaning cloths and much smaller. But you are getting quantity over quality. These are good for dusting. I use them for small projects. I noticed after about 10 washing they are getting thin, but for the price I have no complaints.
These don't clean as well as a thick microfiber, since the fibers are very small, if you have intricate wood work, the fibers are not going to be deep enough to remove dust. Normal dusting they are adequate.