DH and I really liked them. We had some homemade ones that we initially took with us, but they were giving us headaches, etc as they were just too thick or tight and we weren't getting enough airflow. We made it great at home with them in the stores and things, but wearing them ALL day really made a difference. We bought a couple Disney made ones and they were more similar to how we felt in disposables ones, but looked so much cuter for pictures! lol They do run small, so for adults don't go with anything other than a large and my DH really liked the XL even though he has a skinny face. We bought our kids some to take home and got them mediums. (They are 7 and 8.) They have chosen those to wear each day to school, even over their other masks. The only XL we could find in the parks was the Mickey face, but online there are plenty of options.
But there are plenty of people who don't like them either, so YMMV.