They have really clean equipments and efficient dentists. I've had my braces for 3+ years and I have no problem with them. Please do go on weekdays or before before 4-5PM or wait forever in the line.
It's best to come early in the morning from 9 to 12 if you are a walk in appointment. Meaning you don't have an appointment on that day :) since it's early and there's basically no one.