My experiences at Quest Diagnostics are always basically just okay because my expectations are set lower to understand that it will be a few hours to wait for testing when being a walk in unless you go right when they open.
They always mention that you can book an appointment but when I call or check online, it's not really possible.
The waiting area is usually always packed and depending on when you go it can be chaotic. The employees there are nice and courteous as well as very professional especially doing what they have to do for people. Sometimes I end up with additional billing charges but what do you expect from the medical industry.