My biometrics appointment went about the same as yours, June Cleaver. I got there about 40 mins early but went in figuring I'd just wait, no problem. The guard, who was very nice (even with a woman before me who didn't seem to have an appointment but was just in asking loads of questions) asked why I was there and directed me where to go and put my appointment sheet. I waited about 1 min, was called up, had all my prints taken and then my picture, did the comment card, and was back out way before my appointment was actually supposed to start. They didn't seem to pay any attention to scheduled appointments, just took people as they came, which worked for me. But the place was far from crowded anyway.