3D ultrasounds 16-18 weeks

I'm going in for my ultrasound on Saturday for gender determination. I'll be 17 weeks and 2 days and would like to know what to expect. Please drop your 16-18 week 3D ultrasounds below! :) also, please tell me about your experience and if they had any trouble getting baby to cooperate. I'm paying quite a bit for this U/S and I'm afraid to be disappointed if baby isn't at a good angle. I don't want to have to go back and pay again... thanks in advance! :)