I thought that the brush was really amazing, it blends so easily. I was washing it every day to avoid getting bacteria onto new blemishes, and I tried to be very careful to avoid getting water on the ferrule. I'm not sure what happened, but the outer casing on one side (the fluffy side) completely detached after a couple weeks.
The brush still works fine, but now it's kinda a pain to get the lid back onto the fluffy side. It's also now a little less safe traveling, because that whole piece (with the lid attached) could slide off.