Rating Feedback for Dr. Halberstadt (935064)

The rating:
'Dr. Halberstadt is also located in Forest Hills, where I see him. He gave me Invisalign. He is a very nice doctor & knows what he's doing, been in business for over 30 years. His staff is very nice too. He always makes his patients feel comfortable.'
(http://www.ratemds.com/doctor-ratings/376718)
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Just out of curiosity, I know that the prices vary depending on each treatment but how long was your treatment for Invisalign and how much did it come out to be?