A group of us waited over an hour and a half to get in. I was having a CT Scan for which I waited an hour and forty minutes. The machine was not in use because no one went in or out during the wait. It was not lunch time either, so they apparently work at their own pace and the patient's time be damned!
If you use them, be sure to clear most of your day for the wait, because you WILL wait and wait, and wait!