Anyone have any experience working with them for young DC? A bit worried about my 4 year old;s oppositional issues (just, needs to fight every single thing, constantly testing us, etc. - I mean 100% of the time, so possibly beyond what is normal), and in particular how we can best respond to build better behavior and better relationship. They quoted by $2k for a 3 session evaluation, and I know nothing about the practitioner. Would appreciate any feedback.