Now, I can't speak for the other clinics, but this place is terrible. First off, the quality of service is mediocre. They also force you to always see the same dentist and hygienist, so they can never schedule an appointment in a reasonable amount of time or when you need it, think 3 month waiting period, like you have some lasting relationship with someone you've only seen for 5 min once every 6 mos.
I dread my dentist appointment because it means I'll have to move my whole schedule around to accommodate it and if something comes up, I have to wait weeks (at least) to get another appointment.
The only reason I go is because GHC forces you to use them for dental coverage, I think I'm going to drop GHC just because I hate going here for dental.