My 6-year-old has been to see him 3 or 4 times now, and she just loves him, even after having to get a cavity filled. Our previous pediatric dentist's office was fancier and had more toys to play with, and the dentist was good at what she did, but my daughter was intimidated by her and didn't like going there. But she thinks Dr. Marks is funny, and has been happy to go back to see him each time.
He's thorough and gentle and knowledgeable. I like his approach to preventive care, and to teaching kids (and parents) how to take care of their teeth. I highly recommend his practice.